91938605 has 16 divisors (see below), whose sum is σ = 123294528. Its totient is φ = 65232000.

The previous prime is 91938589. The next prime is 91938617. The reversal of 91938605 is 50683919.

It is not a de Polignac number, because 91938605 - 2⁴ = 91938589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18131 + ... + 22640.

It is an arithmetic number, because the mean of its divisors is an integer number (7705908).

Almost surely, 2^91938605 is an apocalyptic number.

It is an amenable number.

91938605 is a deficient number, since it is larger than the sum of its proper divisors (31355923).

91938605 is a wasteful number, since it uses less digits than its factorization.

91938605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40828.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 91938605 is about 9588.4620768922. The cubic root of 91938605 is about 451.3353012828.

The spelling of 91938605 in words is "ninety-one million, nine hundred thirty-eight thousand, six hundred five".