91942391 has 2 divisors, whose sum is σ = 91942392. Its totient is φ = 91942390.

The previous prime is 91942381. The next prime is 91942393. The reversal of 91942391 is 19324919.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91942391 - 2⁶ = 91942327 is a prime.

Together with 91942393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91942393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45971195 + 45971196.

It is an arithmetic number, because the mean of its divisors is an integer number (45971196).

Almost surely, 2^91942391 is an apocalyptic number.

91942391 is a deficient number, since it is larger than the sum of its proper divisors (1).

91942391 is an equidigital number, since it uses as much as digits as its factorization.

91942391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 38.

The square root of 91942391 is about 9588.6594996381. The cubic root of 91942391 is about 451.3414964750.

The spelling of 91942391 in words is "ninety-one million, nine hundred forty-two thousand, three hundred ninety-one".