2151557513 has 12 divisors (see below), whose sum is σ = 2504394180. Its totient is φ = 1843041312.

The previous prime is 2151557491. The next prime is 2151557521. The reversal of 2151557513 is 3157551512.

It can be written as a sum of positive squares in 2 ways, for example, as 1193840704 + 957716809 = 34552^2 + 30947^2 .

It is not a de Polignac number, because 2151557513 - 2⁸ = 2151557257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2151557593) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70895 + ... + 96587.

It is an arithmetic number, because the mean of its divisors is an integer number (208699515).

Almost surely, 2^2151557513 is an apocalyptic number.

It is an amenable number.

2151557513 is a deficient number, since it is larger than the sum of its proper divisors (352836667).

2151557513 is a wasteful number, since it uses less digits than its factorization.

2151557513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27416 (or 27409 counting only the distinct ones).

The product of its digits is 26250, while the sum is 35.

The square root of 2151557513 is about 46384.8845314937. The cubic root of 2151557513 is about 1290.9744681146.

The spelling of 2151557513 in words is "two billion, one hundred fifty-one million, five hundred fifty-seven thousand, five hundred thirteen".