91271957 has 8 divisors (see below), whose sum is σ = 106440000. Its totient is φ = 78232812.

The previous prime is 91271927. The next prime is 91271959. The reversal of 91271957 is 75917219.

It is a happy number.

It is not a de Polignac number, because 91271957 - 2⁸ = 91271701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91271959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132707 + ... + 133392.

It is an arithmetic number, because the mean of its divisors is an integer number (13305000).

Almost surely, 2^91271957 is an apocalyptic number.

It is an amenable number.

91271957 is a deficient number, since it is larger than the sum of its proper divisors (15168043).

91271957 is an equidigital number, since it uses as much as digits as its factorization.

91271957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266120 (or 266106 counting only the distinct ones).

The product of its digits is 39690, while the sum is 41.

The square root of 91271957 is about 9553.6358000502. The cubic root of 91271957 is about 450.2417746036.

The spelling of 91271957 in words is "ninety-one million, two hundred seventy-one thousand, nine hundred fifty-seven".