Search a number
-
+
245431 = 832957
BaseRepresentation
bin111011111010110111
3110110200001
4323322313
530323211
65132131
72041354
oct737267
9413601
10245431
1115843a
12ba047
1387934
146562b
154cac1
hex3beb7

245431 has 4 divisors (see below), whose sum is σ = 248472. Its totient is φ = 242392.

The previous prime is 245419. The next prime is 245437. The reversal of 245431 is 134542.

245431 = T403 + T404 + T405.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134542 = 267271.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-245431 is a prime.

It is a super-2 number, since 2×2454312 = 120472751522, which contains 22 as substring.

It is a Duffinian number.

245431 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 245399 and 245408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1396 + ... + 1561.

It is an arithmetic number, because the mean of its divisors is an integer number (62118).

2245431 is an apocalyptic number.

245431 is the 405-th centered triangular number.

245431 is a deficient number, since it is larger than the sum of its proper divisors (3041).

245431 is an equidigital number, since it uses as much as digits as its factorization.

245431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3040.

The product of its digits is 480, while the sum is 19.

The square root of 245431 is about 495.4099312690. The cubic root of 245431 is about 62.6099185732.

Adding to 245431 its reverse (134542), we get a palindrome (379973).

Subtracting from 245431 its reverse (134542), we obtain a square (110889 = 3332).

It can be divided in two parts, 2454 and 31, that added together give a triangular number (2485 = T70).

The spelling of 245431 in words is "two hundred forty-five thousand, four hundred thirty-one".

Divisors: 1 83 2957 245431