245631 has 8 divisors (see below), whose sum is σ = 335664. Its totient is φ = 159680.

The previous prime is 245629. The next prime is 245639. The reversal of 245631 is 136542.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 245631 - 2¹ = 245629 is a prime.

It is a super-2 number, since 2×245631² = 120669176322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 245598 and 245607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 876 + ... + 1121.

It is an arithmetic number, because the mean of its divisors is an integer number (41958).

2²⁴⁵⁶³¹ is an apocalyptic number.

245631 is a deficient number, since it is larger than the sum of its proper divisors (90033).

245631 is a wasteful number, since it uses less digits than its factorization.

245631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041.

The product of its digits is 720, while the sum is 21.

The square root of 245631 is about 495.6117432023. The cubic root of 245631 is about 62.6269207502.

The spelling of 245631 in words is "two hundred forty-five thousand, six hundred thirty-one".