91557742319 has 4 divisors (see below), whose sum is σ = 93109568520. Its totient is φ = 90005916120.

The previous prime is 91557742313. The next prime is 91557742321. The reversal of 91557742319 is 91324775519.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91324775519 = 947 ⋅96435877.

It is a cyclic number.

It is not a de Polignac number, because 91557742319 - 2²⁸ = 91289306863 is a prime.

It is a super-2 number, since 2×91557742319² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91557742313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 775913012 + ... + 775913129.

It is an arithmetic number, because the mean of its divisors is an integer number (23277392130).

Almost surely, 2^91557742319 is an apocalyptic number.

91557742319 is a deficient number, since it is larger than the sum of its proper divisors (1551826201).

91557742319 is a wasteful number, since it uses less digits than its factorization.

91557742319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551826200.

The product of its digits is 2381400, while the sum is 53.

The spelling of 91557742319 in words is "ninety-one billion, five hundred fifty-seven million, seven hundred forty-two thousand, three hundred nineteen".