91999052 has 12 divisors (see below), whose sum is σ = 162476160. Its totient is φ = 45577296.

The previous prime is 91999051. The next prime is 91999067. The reversal of 91999052 is 25099919.

It is a junction number, because it is equal to n+sod(n) for n = 91998994 and 91999012.

It is not an unprimeable number, because it can be changed into a prime (91999051) 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, 105068 + ... + 105939.

It is an arithmetic number, because the mean of its divisors is an integer number (13539680).

Almost surely, 2^91999052 is an apocalyptic number.

It is an amenable number.

91999052 is a deficient number, since it is larger than the sum of its proper divisors (70477108).

91999052 is a wasteful number, since it uses less digits than its factorization.

91999052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211120 (or 211118 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 44.

The square root of 91999052 is about 9591.6136285820. The cubic root of 91999052 is about 451.4341929584.

The spelling of 91999052 in words is "ninety-one million, nine hundred ninety-nine thousand, fifty-two".