91138793 has 4 divisors (see below), whose sum is σ = 94281540. Its totient is φ = 87996048.

The previous prime is 91138771. The next prime is 91138799. The reversal of 91138793 is 39783119.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40615129 + 50523664 = 6373^2 + 7108^2 .

It is a cyclic number.

It is not a de Polignac number, because 91138793 - 2¹⁸ = 90876649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91138793.

It is not an unprimeable number, because it can be changed into a prime (91138799) 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, 1571330 + ... + 1571387.

It is an arithmetic number, because the mean of its divisors is an integer number (23570385).

Almost surely, 2^91138793 is an apocalyptic number.

It is an amenable number.

91138793 is a deficient number, since it is larger than the sum of its proper divisors (3142747).

91138793 is a wasteful number, since it uses less digits than its factorization.

91138793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3142746.

The product of its digits is 40824, while the sum is 41.

The square root of 91138793 is about 9546.6639722994. The cubic root of 91138793 is about 450.0227033813.

The spelling of 91138793 in words is "ninety-one million, one hundred thirty-eight thousand, seven hundred ninety-three".