2115515291 has 2 divisors, whose sum is σ = 2115515292. Its totient is φ = 2115515290.

The previous prime is 2115515279. The next prime is 2115515323. The reversal of 2115515291 is 1925155112.

It is an a-pointer prime, because the next prime (2115515323) can be obtained adding 2115515291 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2115515291 is a prime.

It is not a weakly prime, because it can be changed into another prime (2115515221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1057757645 + 1057757646.

It is an arithmetic number, because the mean of its divisors is an integer number (1057757646).

Almost surely, 2^2115515291 is an apocalyptic number.

2115515291 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115515291 is an equidigital number, since it uses as much as digits as its factorization.

2115515291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4500, while the sum is 32.

The square root of 2115515291 is about 45994.7311221622. The cubic root of 2115515291 is about 1283.7251692837.

The spelling of 2115515291 in words is "two billion, one hundred fifteen million, five hundred fifteen thousand, two hundred ninety-one".