2551322521 has 4 divisors (see below), whose sum is σ = 2783260944. Its totient is φ = 2319384100.

The previous prime is 2551322509. The next prime is 2551322593. The reversal of 2551322521 is 1252231552.

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 2551322521 - 2¹³ = 2551314329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2551322521.

It is not an unprimeable number, because it can be changed into a prime (2551325521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115969195 + ... + 115969216.

It is an arithmetic number, because the mean of its divisors is an integer number (695815236).

Almost surely, 2^2551322521 is an apocalyptic number.

It is an amenable number.

2551322521 is a deficient number, since it is larger than the sum of its proper divisors (231938423).

2551322521 is a wasteful number, since it uses less digits than its factorization.

2551322521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231938422.

The product of its digits is 6000, while the sum is 28.

The square root of 2551322521 is about 50510.6179035656. The cubic root of 2551322521 is about 1366.4333534363.

The spelling of 2551322521 in words is "two billion, five hundred fifty-one million, three hundred twenty-two thousand, five hundred twenty-one".