91371023 has 2 divisors, whose sum is σ = 91371024. Its totient is φ = 91371022.

The previous prime is 91370989. The next prime is 91371031. The reversal of 91371023 is 32017319.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91371023 - 2¹² = 91366927 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 91370983 and 91371001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91371223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45685511 + 45685512.

It is an arithmetic number, because the mean of its divisors is an integer number (45685512).

Almost surely, 2^91371023 is an apocalyptic number.

91371023 is a deficient number, since it is larger than the sum of its proper divisors (1).

91371023 is an equidigital number, since it uses as much as digits as its factorization.

91371023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 91371023 is about 9558.8191216279. The cubic root of 91371023 is about 450.4046122203.

The spelling of 91371023 in words is "ninety-one million, three hundred seventy-one thousand, twenty-three".