2155515113 has 4 divisors (see below), whose sum is σ = 2157170688. Its totient is φ = 2153859540.

The previous prime is 2155515067. The next prime is 2155515139. The reversal of 2155515113 is 3115155512.

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 a cyclic number.

It is not a de Polignac number, because 2155515113 - 2⁶ = 2155515049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155515143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 825833 + ... + 828438.

It is an arithmetic number, because the mean of its divisors is an integer number (539292672).

Almost surely, 2^2155515113 is an apocalyptic number.

It is an amenable number.

2155515113 is a deficient number, since it is larger than the sum of its proper divisors (1655575).

2155515113 is a wasteful number, since it uses less digits than its factorization.

2155515113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655574.

The product of its digits is 3750, while the sum is 29.

The square root of 2155515113 is about 46427.5253809634. The cubic root of 2155515113 is about 1291.7655277857.

The spelling of 2155515113 in words is "two billion, one hundred fifty-five million, five hundred fifteen thousand, one hundred thirteen".