91599049 has 4 divisors (see below), whose sum is σ = 92702736. Its totient is φ = 90495364.

The previous prime is 91599047. The next prime is 91599061. The reversal of 91599049 is 94099519.

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 91599049 - 2¹ = 91599047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91599047) 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, 551719 + ... + 551884.

It is an arithmetic number, because the mean of its divisors is an integer number (23175684).

Almost surely, 2^91599049 is an apocalyptic number.

It is an amenable number.

91599049 is a deficient number, since it is larger than the sum of its proper divisors (1103687).

91599049 is a wasteful number, since it uses less digits than its factorization.

91599049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103686.

The product of its (nonzero) digits is 131220, while the sum is 46.

The square root of 91599049 is about 9570.7392086505. The cubic root of 91599049 is about 450.7789783334.

The spelling of 91599049 in words is "ninety-one million, five hundred ninety-nine thousand, forty-nine".