91739574357 has 4 divisors (see below), whose sum is σ = 122319432480. Its totient is φ = 61159716236.

The previous prime is 91739574347. The next prime is 91739574397. The reversal of 91739574357 is 75347593719.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91739574357 - 2⁴ = 91739574341 is a prime.

It is a super-2 number, since 2×91739574357² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91739574357.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91739574347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15289929057 + ... + 15289929062.

It is an arithmetic number, because the mean of its divisors is an integer number (30579858120).

Almost surely, 2^91739574357 is an apocalyptic number.

It is an amenable number.

91739574357 is a deficient number, since it is larger than the sum of its proper divisors (30579858123).

91739574357 is a wasteful number, since it uses less digits than its factorization.

91739574357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30579858122.

The product of its digits is 25004700, while the sum is 60.

The spelling of 91739574357 in words is "ninety-one billion, seven hundred thirty-nine million, five hundred seventy-four thousand, three hundred fifty-seven".