91371393 has 6 divisors (see below), whose sum is σ = 131980914. Its totient is φ = 60914256.

The previous prime is 91371383. The next prime is 91371409. The reversal of 91371393 is 39317319.

It can be written as a sum of positive squares in only one way, i.e., 56655729 + 34715664 = 7527^2 + 5892^2 .

It is not a de Polignac number, because 91371393 - 2⁴ = 91371377 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91371383) 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 5 ways as a sum of consecutive naturals, for example, 5076180 + ... + 5076197.

It is an arithmetic number, because the mean of its divisors is an integer number (21996819).

Almost surely, 2^91371393 is an apocalyptic number.

It is an amenable number.

91371393 is a deficient number, since it is larger than the sum of its proper divisors (40609521).

91371393 is a wasteful number, since it uses less digits than its factorization.

91371393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10152383 (or 10152380 counting only the distinct ones).

The product of its digits is 15309, while the sum is 36.

The square root of 91371393 is about 9558.8384754634. The cubic root of 91371393 is about 450.4052201792.

The spelling of 91371393 in words is "ninety-one million, three hundred seventy-one thousand, three hundred ninety-three".