2665631 has 6 divisors (see below), whose sum is σ = 2787120. Its totient is φ = 2549228.

The previous prime is 2665627. The next prime is 2665667. The reversal of 2665631 is 1365662.

It is not a de Polignac number, because 2665631 - 2² = 2665627 is a prime.

It is a super-2 number, since 2×2665631² = 14211177256322, 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 = 2665594 and 2665603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665601) 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, 1991 + ... + 3048.

It is an arithmetic number, because the mean of its divisors is an integer number (464520).

2^2665631 is an apocalyptic number.

2665631 is a deficient number, since it is larger than the sum of its proper divisors (121489).

2665631 is an equidigital number, since it uses as much as digits as its factorization.

2665631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5085 (or 5062 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 2665631 is about 1632.6760242008. The cubic root of 2665631 is about 138.6543002666.

The spelling of 2665631 in words is "two million, six hundred sixty-five thousand, six hundred thirty-one".