855631 has 8 divisors (see below), whose sum is σ = 1009664. Its totient is φ = 709560.

The previous prime is 855619. The next prime is 855641. The reversal of 855631 is 136558.

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 855631 - 2⁹ = 855119 is a prime.

It is a super-2 number, since 2×855631² = 1464208816322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 855631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855601) 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 7 ways as a sum of consecutive naturals, for example, 1755 + ... + 2188.

It is an arithmetic number, because the mean of its divisors is an integer number (126208).

2⁸⁵⁵⁶³¹ is an apocalyptic number.

855631 is a deficient number, since it is larger than the sum of its proper divisors (154033).

855631 is a wasteful number, since it uses less digits than its factorization.

855631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3981.

The product of its digits is 3600, while the sum is 28.

The square root of 855631 is about 925.0032432376. The cubic root of 855631 is about 94.9355426099.

The spelling of 855631 in words is "eight hundred fifty-five thousand, six hundred thirty-one".