91475939 has 2 divisors, whose sum is σ = 91475940. Its totient is φ = 91475938.

The previous prime is 91475911. The next prime is 91475957. The reversal of 91475939 is 93957419.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91475939 - 2¹² = 91471843 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91475893 and 91475902.

It is not a weakly prime, because it can be changed into another prime (91475039) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45737969 + 45737970.

It is an arithmetic number, because the mean of its divisors is an integer number (45737970).

Almost surely, 2^91475939 is an apocalyptic number.

91475939 is a deficient number, since it is larger than the sum of its proper divisors (1).

91475939 is an equidigital number, since it uses as much as digits as its factorization.

91475939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 306180, while the sum is 47.

The square root of 91475939 is about 9564.3054635452. The cubic root of 91475939 is about 450.5769373685.

The spelling of 91475939 in words is "ninety-one million, four hundred seventy-five thousand, nine hundred thirty-nine".