91951423 has 2 divisors, whose sum is σ = 91951424. Its totient is φ = 91951422.

The previous prime is 91951399. The next prime is 91951427. The reversal of 91951423 is 32415919.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91951423 - 2¹³ = 91943231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91951427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45975711 + 45975712.

It is an arithmetic number, because the mean of its divisors is an integer number (45975712).

Almost surely, 2^91951423 is an apocalyptic number.

91951423 is a deficient number, since it is larger than the sum of its proper divisors (1).

91951423 is an equidigital number, since it uses as much as digits as its factorization.

91951423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 34.

The square root of 91951423 is about 9589.1304611002. The cubic root of 91951423 is about 451.3562752325.

The spelling of 91951423 in words is "ninety-one million, nine hundred fifty-one thousand, four hundred twenty-three".