115517251 has 2 divisors, whose sum is σ = 115517252. Its totient is φ = 115517250.

The previous prime is 115517249. The next prime is 115517257. The reversal of 115517251 is 152715511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 115517251 - 2¹ = 115517249 is a prime.

Together with 115517249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (115517257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57758625 + 57758626.

It is an arithmetic number, because the mean of its divisors is an integer number (57758626).

Almost surely, 2^115517251 is an apocalyptic number.

115517251 is a deficient number, since it is larger than the sum of its proper divisors (1).

115517251 is an equidigital number, since it uses as much as digits as its factorization.

115517251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1750, while the sum is 28.

The square root of 115517251 is about 10747.8951892917. The cubic root of 115517251 is about 487.0224133649.

The spelling of 115517251 in words is "one hundred fifteen million, five hundred seventeen thousand, two hundred fifty-one".