91510157 has 2 divisors, whose sum is σ = 91510158. Its totient is φ = 91510156.

The previous prime is 91510127. The next prime is 91510163. The reversal of 91510157 is 75101519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75099556 + 16410601 = 8666^2 + 4051^2 .

It is an emirp because it is prime and its reverse (75101519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91510157 - 2⁶ = 91510093 is a prime.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 91510157 parts by 13528 straight cuts.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91510127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45755078 + 45755079.

It is an arithmetic number, because the mean of its divisors is an integer number (45755079).

Almost surely, 2^91510157 is an apocalyptic number.

It is an amenable number.

91510157 is a deficient number, since it is larger than the sum of its proper divisors (1).

91510157 is an equidigital number, since it uses as much as digits as its factorization.

91510157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1575, while the sum is 29.

The square root of 91510157 is about 9566.0941350167. The cubic root of 91510157 is about 450.6331121389.

The spelling of 91510157 in words is "ninety-one million, five hundred ten thousand, one hundred fifty-seven".