91940518 has 4 divisors (see below), whose sum is σ = 137910780. Its totient is φ = 45970258.

The previous prime is 91940509. The next prime is 91940521. The reversal of 91940518 is 81504919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81504919 = 17 ⋅4794407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22985128 + ... + 22985131.

It is an arithmetic number, because the mean of its divisors is an integer number (34477695).

Almost surely, 2^91940518 is an apocalyptic number.

91940518 is a deficient number, since it is larger than the sum of its proper divisors (45970262).

91940518 is a wasteful number, since it uses less digits than its factorization.

91940518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45970261.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 91940518 is about 9588.5618316826. The cubic root of 91940518 is about 451.3384316270.

The spelling of 91940518 in words is "ninety-one million, nine hundred forty thousand, five hundred eighteen".