2531656013 has 4 divisors (see below), whose sum is σ = 2613322368. Its totient is φ = 2449989660.

The previous prime is 2531656009. The next prime is 2531656051. The reversal of 2531656013 is 3106561352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2531656013 - 2² = 2531656009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2531656063) 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, 40833131 + ... + 40833192.

It is an arithmetic number, because the mean of its divisors is an integer number (653330592).

Almost surely, 2^2531656013 is an apocalyptic number.

It is an amenable number.

2531656013 is a deficient number, since it is larger than the sum of its proper divisors (81666355).

2531656013 is an equidigital number, since it uses as much as digits as its factorization.

2531656013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81666354.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 2531656013 is about 50315.5643215894. The cubic root of 2531656013 is about 1362.9133073540.

The spelling of 2531656013 in words is "two billion, five hundred thirty-one million, six hundred fifty-six thousand, thirteen".