91516157 has 2 divisors, whose sum is σ = 91516158. Its totient is φ = 91516156.

The previous prime is 91516129. The next prime is 91516163. The reversal of 91516157 is 75161519.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87871876 + 3644281 = 9374^2 + 1909^2 .

It is an emirp because it is prime and its reverse (75161519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91516157 - 2⁶ = 91516093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91516127) 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, 45758078 + 45758079.

It is an arithmetic number, because the mean of its divisors is an integer number (45758079).

Almost surely, 2^91516157 is an apocalyptic number.

It is an amenable number.

91516157 is a deficient number, since it is larger than the sum of its proper divisors (1).

91516157 is an equidigital number, since it uses as much as digits as its factorization.

91516157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9450, while the sum is 35.

The square root of 91516157 is about 9566.4077374948. The cubic root of 91516157 is about 450.6429607345.

The spelling of 91516157 in words is "ninety-one million, five hundred sixteen thousand, one hundred fifty-seven".