91129938 has 16 divisors (see below), whose sum is σ = 182671200. Its totient is φ = 30308096.

The previous prime is 91129903. The next prime is 91129939. The reversal of 91129938 is 83992119.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91129938.

It is not an unprimeable number, because it can be changed into a prime (91129939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14220 + ... + 19607.

It is an arithmetic number, because the mean of its divisors is an integer number (11416950).

Almost surely, 2^91129938 is an apocalyptic number.

91129938 is an abundant number, since it is smaller than the sum of its proper divisors (91541262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91129938 is a wasteful number, since it uses less digits than its factorization.

91129938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34281.

The product of its digits is 34992, while the sum is 42.

The square root of 91129938 is about 9546.2001864616. The cubic root of 91129938 is about 450.0081282482.

The spelling of 91129938 in words is "ninety-one million, one hundred twenty-nine thousand, nine hundred thirty-eight".