2257521538 has 32 divisors (see below), whose sum is σ = 3543989760. Its totient is φ = 1077760320.

The previous prime is 2257521529. The next prime is 2257521547. The reversal of 2257521538 is 8351257522.

It is an interprime number because it is at equal distance from previous prime (2257521529) and next prime (2257521547).

It is a self number, because there is not a number n which added to its sum of digits gives 2257521538.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 592656 + ... + 596452.

It is an arithmetic number, because the mean of its divisors is an integer number (110749680).

Almost surely, 2^2257521538 is an apocalyptic number.

2257521538 is a deficient number, since it is larger than the sum of its proper divisors (1286468222).

2257521538 is a wasteful number, since it uses less digits than its factorization.

2257521538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4002.

The product of its digits is 168000, while the sum is 40.

The square root of 2257521538 is about 47513.3827252912. The cubic root of 2257521538 is about 1311.8292216645.

The spelling of 2257521538 in words is "two billion, two hundred fifty-seven million, five hundred twenty-one thousand, five hundred thirty-eight".