809631 has 6 divisors (see below), whose sum is σ = 1169480. Its totient is φ = 539748.

The previous prime is 809629. The next prime is 809701. The reversal of 809631 is 136908.

It is not a de Polignac number, because 809631 - 2¹ = 809629 is a prime.

It is a super-2 number, since 2×809631² = 1311004712322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 809595 and 809604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44971 + ... + 44988.

2⁸⁰⁹⁶³¹ is an apocalyptic number.

809631 is a deficient number, since it is larger than the sum of its proper divisors (359849).

809631 is a wasteful number, since it uses less digits than its factorization.

809631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89965 (or 89962 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 809631 is about 899.7949766475. The cubic root of 809631 is about 93.2028178583.

The spelling of 809631 in words is "eight hundred nine thousand, six hundred thirty-one".