915121157 has 2 divisors, whose sum is σ = 915121158. Its totient is φ = 915121156.

The previous prime is 915121133. The next prime is 915121199. The reversal of 915121157 is 751121519.

It is a happy number.

915121157 is nontrivially palindromic in base 3.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 874148356 + 40972801 = 29566^2 + 6401^2 .

It is a cyclic number.

It is not a de Polignac number, because 915121157 - 2²² = 910926853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (915121957) 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, 457560578 + 457560579.

It is an arithmetic number, because the mean of its divisors is an integer number (457560579).

Almost surely, 2^915121157 is an apocalyptic number.

It is an amenable number.

915121157 is a deficient number, since it is larger than the sum of its proper divisors (1).

915121157 is an equidigital number, since it uses as much as digits as its factorization.

915121157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3150, while the sum is 32.

The square root of 915121157 is about 30250.9695216534. The cubic root of 915121157 is about 970.8665360381.

The spelling of 915121157 in words is "nine hundred fifteen million, one hundred twenty-one thousand, one hundred fifty-seven".