2909631 has 4 divisors (see below), whose sum is σ = 3879512. Its totient is φ = 1939752.

The previous prime is 2909623. The next prime is 2909633. The reversal of 2909631 is 1369092.

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

It is not a de Polignac number, because 2909631 - 2³ = 2909623 is a prime.

It is a super-2 number, since 2×2909631² = 16931905112322, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2909633) 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, 484936 + ... + 484941.

It is an arithmetic number, because the mean of its divisors is an integer number (969878).

2^2909631 is an apocalyptic number.

2909631 is a deficient number, since it is larger than the sum of its proper divisors (969881).

2909631 is an equidigital number, since it uses as much as digits as its factorization.

2909631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969880.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 2909631 is about 1705.7640516789. The cubic root of 2909631 is about 142.7620048935.

The spelling of 2909631 in words is "two million, nine hundred nine thousand, six hundred thirty-one".