245381 has 4 divisors (see below), whose sum is σ = 249600. Its totient is φ = 241164.

The previous prime is 245339. The next prime is 245383. The reversal of 245381 is 183542.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183542 = 2 ⋅91771.

It is a cyclic number.

It is not a de Polignac number, because 245381 - 2⁶ = 245317 is a prime.

It is a super-2 number, since 2×245381² = 120423670322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2021 + ... + 2138.

It is an arithmetic number, because the mean of its divisors is an integer number (62400).

2²⁴⁵³⁸¹ is an apocalyptic number.

It is an amenable number.

245381 is a deficient number, since it is larger than the sum of its proper divisors (4219).

245381 is an equidigital number, since it uses as much as digits as its factorization.

245381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4218.

The product of its digits is 960, while the sum is 23.

The square root of 245381 is about 495.3594654390. The cubic root of 245381 is about 62.6056665858.

It can be divided in two parts, 245 and 381, that added together give a palindrome (626).

The spelling of 245381 in words is "two hundred forty-five thousand, three hundred eighty-one".