91157623 has 2 divisors, whose sum is σ = 91157624. Its totient is φ = 91157622.

The previous prime is 91157609. The next prime is 91157629. The reversal of 91157623 is 32675119.

It is a strong prime.

It is an emirp because it is prime and its reverse (32675119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91157623 - 2¹³ = 91149431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91157629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45578811 + 45578812.

It is an arithmetic number, because the mean of its divisors is an integer number (45578812).

Almost surely, 2^91157623 is an apocalyptic number.

91157623 is a deficient number, since it is larger than the sum of its proper divisors (1).

91157623 is an equidigital number, since it uses as much as digits as its factorization.

91157623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 34.

The square root of 91157623 is about 9547.6501297440. The cubic root of 91157623 is about 450.0536940045.

The spelling of 91157623 in words is "ninety-one million, one hundred fifty-seven thousand, six hundred twenty-three".