91615423 has 2 divisors, whose sum is σ = 91615424. Its totient is φ = 91615422.

The previous prime is 91615373. The next prime is 91615453. The reversal of 91615423 is 32451619.

It is a strong prime.

It is an emirp because it is prime and its reverse (32451619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91615423 - 2²⁵ = 58060991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91615453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45807711 + 45807712.

It is an arithmetic number, because the mean of its divisors is an integer number (45807712).

Almost surely, 2^91615423 is an apocalyptic number.

91615423 is a deficient number, since it is larger than the sum of its proper divisors (1).

91615423 is an equidigital number, since it uses as much as digits as its factorization.

91615423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 91615423 is about 9571.5945902446. The cubic root of 91615423 is about 450.8058367463.

The spelling of 91615423 in words is "ninety-one million, six hundred fifteen thousand, four hundred twenty-three".