115657121 has 2 divisors, whose sum is σ = 115657122. Its totient is φ = 115657120.

The previous prime is 115657117. The next prime is 115657147. The reversal of 115657121 is 121756511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73342096 + 42315025 = 8564^2 + 6505^2 .

It is a cyclic number.

It is not a de Polignac number, because 115657121 - 2² = 115657117 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (115650121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57828560 + 57828561.

It is an arithmetic number, because the mean of its divisors is an integer number (57828561).

Almost surely, 2^115657121 is an apocalyptic number.

It is an amenable number.

115657121 is a deficient number, since it is larger than the sum of its proper divisors (1).

115657121 is an equidigital number, since it uses as much as digits as its factorization.

115657121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2100, while the sum is 29.

The square root of 115657121 is about 10754.4000762479. The cubic root of 115657121 is about 487.2188987365.

It can be divided in two parts, 1156 and 57121, that multiplied together give a square (66031876 = 8126²).

The spelling of 115657121 in words is "one hundred fifteen million, six hundred fifty-seven thousand, one hundred twenty-one".