3091631 has 4 divisors (see below), whose sum is σ = 3099600. Its totient is φ = 3083664.

The previous prime is 3091607. The next prime is 3091633. The reversal of 3091631 is 1361903.

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 3091631 - 2¹⁸ = 2829487 is a prime.

It is a super-2 number, since 2×3091631² = 19116364480322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3091597 and 3091606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3091633) 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, 3371 + ... + 4188.

It is an arithmetic number, because the mean of its divisors is an integer number (774900).

Almost surely, 2^3091631 is an apocalyptic number.

3091631 is a deficient number, since it is larger than the sum of its proper divisors (7969).

3091631 is an equidigital number, since it uses as much as digits as its factorization.

3091631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7968.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 3091631 is about 1758.3034436638. The cubic root of 3091631 is about 145.6786420297.

The spelling of 3091631 in words is "three million, ninety-one thousand, six hundred thirty-one".