91899493 has 4 divisors (see below), whose sum is σ = 105028000. Its totient is φ = 78770988.

The previous prime is 91899473. The next prime is 91899499. The reversal of 91899493 is 39499819.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91899493 - 2⁵ = 91899461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91899493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91899499) 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, 6564243 + ... + 6564256.

It is an arithmetic number, because the mean of its divisors is an integer number (26257000).

Almost surely, 2^91899493 is an apocalyptic number.

It is an amenable number.

91899493 is a deficient number, since it is larger than the sum of its proper divisors (13128507).

91899493 is a wasteful number, since it uses less digits than its factorization.

91899493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13128506.

The product of its digits is 629856, while the sum is 52.

The square root of 91899493 is about 9586.4223253516. The cubic root of 91899493 is about 451.2712907034.

The spelling of 91899493 in words is "ninety-one million, eight hundred ninety-nine thousand, four hundred ninety-three".