6291631 has 4 divisors (see below), whose sum is σ = 6437992. Its totient is φ = 6145272.

The previous prime is 6291619. The next prime is 6291653. The reversal of 6291631 is 1361926.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6291631 - 2⁵ = 6291599 is a prime.

It is a super-2 number, since 2×6291631² = 79169241280322, 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 6291631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6291611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73116 + ... + 73201.

It is an arithmetic number, because the mean of its divisors is an integer number (1609498).

Almost surely, 2^6291631 is an apocalyptic number.

6291631 is a deficient number, since it is larger than the sum of its proper divisors (146361).

6291631 is a wasteful number, since it uses less digits than its factorization.

6291631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146360.

The product of its digits is 1944, while the sum is 28.

The square root of 6291631 is about 2508.3123808649. The cubic root of 6291631 is about 184.6096566376.

The spelling of 6291631 in words is "six million, two hundred ninety-one thousand, six hundred thirty-one".