91712939 has 2 divisors, whose sum is σ = 91712940. Its totient is φ = 91712938.

The previous prime is 91712903. The next prime is 91712953. The reversal of 91712939 is 93921719.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91712939 is a prime.

It is a super-2 number, since 2×91712939² = 16822526360035442, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91712896 and 91712905.

It is not a weakly prime, because it can be changed into another prime (91714939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45856469 + 45856470.

It is an arithmetic number, because the mean of its divisors is an integer number (45856470).

Almost surely, 2^91712939 is an apocalyptic number.

91712939 is a deficient number, since it is larger than the sum of its proper divisors (1).

91712939 is an equidigital number, since it uses as much as digits as its factorization.

91712939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 41.

The square root of 91712939 is about 9576.6872664821. The cubic root of 91712939 is about 450.9657268331.

The spelling of 91712939 in words is "ninety-one million, seven hundred twelve thousand, nine hundred thirty-nine".