845631 has 12 divisors (see below), whose sum is σ = 1293552. Its totient is φ = 530496.

The previous prime is 845623. The next prime is 845653. The reversal of 845631 is 136548.

It is not a de Polignac number, because 845631 - 2³ = 845623 is a prime.

It is a super-2 number, since 2×845631² = 1430183576322, which contains 22 as substring.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 845595 and 845604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2611 + ... + 2916.

It is an arithmetic number, because the mean of its divisors is an integer number (107796).

2⁸⁴⁵⁶³¹ is an apocalyptic number.

845631 is a deficient number, since it is larger than the sum of its proper divisors (447921).

845631 is a wasteful number, since it uses less digits than its factorization.

845631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5550 (or 5547 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 845631 is about 919.5819702452. The cubic root of 845631 is about 94.5642462255.

The spelling of 845631 in words is "eight hundred forty-five thousand, six hundred thirty-one".