91943879 has 2 divisors, whose sum is σ = 91943880. Its totient is φ = 91943878.

The previous prime is 91943843. The next prime is 91943893. The reversal of 91943879 is 97834919.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91943879 - 2⁸ = 91943623 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91945879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45971939 + 45971940.

It is an arithmetic number, because the mean of its divisors is an integer number (45971940).

Almost surely, 2^91943879 is an apocalyptic number.

91943879 is a deficient number, since it is larger than the sum of its proper divisors (1).

91943879 is an equidigital number, since it uses as much as digits as its factorization.

91943879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 50.

The square root of 91943879 is about 9588.7370909834. The cubic root of 91943879 is about 451.3439313059.

The spelling of 91943879 in words is "ninety-one million, nine hundred forty-three thousand, eight hundred seventy-nine".