2115256081 has 2 divisors, whose sum is σ = 2115256082. Its totient is φ = 2115256080.

The previous prime is 2115256063. The next prime is 2115256109. The reversal of 2115256081 is 1806525112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1374926400 + 740329681 = 37080^2 + 27209^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2115256081 is a prime.

It is a super-2 number, since 2×2115256081² = 8948616576414957122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2115256061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1057628040 + 1057628041.

It is an arithmetic number, because the mean of its divisors is an integer number (1057628041).

Almost surely, 2^2115256081 is an apocalyptic number.

It is an amenable number.

2115256081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115256081 is an equidigital number, since it uses as much as digits as its factorization.

2115256081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 2115256081 is about 45991.9132130856. The cubic root of 2115256081 is about 1283.6727363542.

The spelling of 2115256081 in words is "two billion, one hundred fifteen million, two hundred fifty-six thousand, eighty-one".