91571371 has 2 divisors, whose sum is σ = 91571372. Its totient is φ = 91571370.

The previous prime is 91571341. The next prime is 91571423. The reversal of 91571371 is 17317519.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91571371 - 2⁹ = 91570859 is a prime.

It is not a weakly prime, because it can be changed into another prime (91571341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45785685 + 45785686.

It is an arithmetic number, because the mean of its divisors is an integer number (45785686).

Almost surely, 2^91571371 is an apocalyptic number.

91571371 is a deficient number, since it is larger than the sum of its proper divisors (1).

91571371 is an equidigital number, since it uses as much as digits as its factorization.

91571371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6615, while the sum is 34.

The square root of 91571371 is about 9569.2931295890. The cubic root of 91571371 is about 450.7335705932.

The spelling of 91571371 in words is "ninety-one million, five hundred seventy-one thousand, three hundred seventy-one".