2152597581 has 24 divisors (see below), whose sum is σ = 3200932280. Its totient is φ = 1392961536.

The previous prime is 2152597541. The next prime is 2152597589. The reversal of 2152597581 is 1857952512.

2152597581 is a `hidden beast` number, since 2 + 1 + 5 + 2 + 597 + 58 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 689535081 + 1463062500 = 26259^2 + 38250^2 .

It is not a de Polignac number, because 2152597581 - 2⁷ = 2152597453 is a prime.

It is a super-2 number, since 2×2152597581² = 9267352691454103122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2152597589) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136725 + ... + 151653.

Almost surely, 2^2152597581 is an apocalyptic number.

It is an amenable number.

2152597581 is a deficient number, since it is larger than the sum of its proper divisors (1048334699).

2152597581 is a wasteful number, since it uses less digits than its factorization.

2152597581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15405 (or 15402 counting only the distinct ones).

The product of its digits is 252000, while the sum is 45.

The square root of 2152597581 is about 46396.0944584779. The cubic root of 2152597581 is about 1291.1824546435.

The spelling of 2152597581 in words is "two billion, one hundred fifty-two million, five hundred ninety-seven thousand, five hundred eighty-one".