Search a number
-
+
281431 is a prime number
BaseRepresentation
bin1000100101101010111
3112022001101
41010231113
533001211
610010531
72251333
oct1045527
9468041
10281431
11182497
12116a47
139b137
14747c3
15585c1
hex44b57

281431 has 2 divisors, whose sum is σ = 281432. Its totient is φ = 281430.

The previous prime is 281429. The next prime is 281509. The reversal of 281431 is 134182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 281431 - 21 = 281429 is a prime.

It is a super-2 number, since 2×2814312 = 158406815522, which contains 22 as substring.

Together with 281429, it forms a pair of twin primes.

It is a Chen prime.

It is the 531-st Hogben number.

It is a junction number, because it is equal to n+sod(n) for n = 281399 and 281408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281131) by changing a digit.

It is a nontrivial repunit in base 530.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140715 + 140716.

It is an arithmetic number, because the mean of its divisors is an integer number (140716).

2281431 is an apocalyptic number.

281431 is a deficient number, since it is larger than the sum of its proper divisors (1).

281431 is an equidigital number, since it uses as much as digits as its factorization.

281431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 19.

The square root of 281431 is about 530.5007068798. The cubic root of 281431 is about 65.5325867803.

The spelling of 281431 in words is "two hundred eighty-one thousand, four hundred thirty-one".