2521616313 has 4 divisors (see below), whose sum is σ = 3362155088. Its totient is φ = 1681077540.

The previous prime is 2521616309. The next prime is 2521616327. The reversal of 2521616313 is 3136161252.

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 not a de Polignac number, because 2521616313 - 2² = 2521616309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2521614313) 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, 420269383 + ... + 420269388.

It is an arithmetic number, because the mean of its divisors is an integer number (840538772).

Almost surely, 2^2521616313 is an apocalyptic number.

It is an amenable number.

2521616313 is a deficient number, since it is larger than the sum of its proper divisors (840538775).

2521616313 is an equidigital number, since it uses as much as digits as its factorization.

2521616313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840538774.

The product of its digits is 6480, while the sum is 30.

The square root of 2521616313 is about 50215.6978742704. The cubic root of 2521616313 is about 1361.1093012892.

Adding to 2521616313 its reverse (3136161252), we get a palindrome (5657777565).

The spelling of 2521616313 in words is "two billion, five hundred twenty-one million, six hundred sixteen thousand, three hundred thirteen".