91990029 has 16 divisors (see below), whose sum is σ = 128904512. Its totient is φ = 58278528.

The previous prime is 91990007. The next prime is 91990081. The reversal of 91990029 is 92009919.

It is a happy number.

It is not a de Polignac number, because 91990029 - 2⁷ = 91989901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91980029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4864 + ... + 14409.

It is an arithmetic number, because the mean of its divisors is an integer number (8056532).

Almost surely, 2^91990029 is an apocalyptic number.

It is an amenable number.

91990029 is a deficient number, since it is larger than the sum of its proper divisors (36914483).

91990029 is a wasteful number, since it uses less digits than its factorization.

91990029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19356.

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 91990029 is about 9591.1432582357. The cubic root of 91990029 is about 451.4194340241.

The spelling of 91990029 in words is "ninety-one million, nine hundred ninety thousand, twenty-nine".