91251271 has 2 divisors, whose sum is σ = 91251272. Its totient is φ = 91251270.

The previous prime is 91251239. The next prime is 91251283. The reversal of 91251271 is 17215219.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91251271 - 2⁵ = 91251239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91251211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45625635 + 45625636.

It is an arithmetic number, because the mean of its divisors is an integer number (45625636).

Almost surely, 2^91251271 is an apocalyptic number.

91251271 is a deficient number, since it is larger than the sum of its proper divisors (1).

91251271 is an equidigital number, since it uses as much as digits as its factorization.

91251271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 28.

The square root of 91251271 is about 9552.5531142203. The cubic root of 91251271 is about 450.2077575649.

The spelling of 91251271 in words is "ninety-one million, two hundred fifty-one thousand, two hundred seventy-one".