2564291521 has 4 divisors (see below), whose sum is σ = 2797408944. Its totient is φ = 2331174100.

The previous prime is 2564291503. The next prime is 2564291539. The reversal of 2564291521 is 1251924652.

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 an interprime number because it is at equal distance from previous prime (2564291503) and next prime (2564291539).

It is a cyclic number.

It is not a de Polignac number, because 2564291521 - 2⁷ = 2564291393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2564291581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116558695 + ... + 116558716.

It is an arithmetic number, because the mean of its divisors is an integer number (699352236).

Almost surely, 2^2564291521 is an apocalyptic number.

It is an amenable number.

2564291521 is a deficient number, since it is larger than the sum of its proper divisors (233117423).

2564291521 is a wasteful number, since it uses less digits than its factorization.

2564291521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233117422.

The product of its digits is 43200, while the sum is 37.

The square root of 2564291521 is about 50638.8341196754. The cubic root of 2564291521 is about 1368.7447470146.

The spelling of 2564291521 in words is "two billion, five hundred sixty-four million, two hundred ninety-one thousand, five hundred twenty-one".