91998083 has 4 divisors (see below), whose sum is σ = 92048088. Its totient is φ = 91948080.

The previous prime is 91998079. The next prime is 91998119. The reversal of 91998083 is 38089919.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91998083 - 2² = 91998079 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91998013) 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, 22133 + ... + 25958.

It is an arithmetic number, because the mean of its divisors is an integer number (23012022).

Almost surely, 2^91998083 is an apocalyptic number.

91998083 is a deficient number, since it is larger than the sum of its proper divisors (50005).

91998083 is a wasteful number, since it uses less digits than its factorization.

91998083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50004.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 91998083 is about 9591.5631155719. The cubic root of 91998083 is about 451.4326080100.

The spelling of 91998083 in words is "ninety-one million, nine hundred ninety-eight thousand, eighty-three".