90591599 has 4 divisors (see below), whose sum is σ = 103533264. Its totient is φ = 77649936.

The previous prime is 90591593. The next prime is 90591617. The reversal of 90591599 is 99519509.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99519509 = 269 ⋅369961.

It is a de Polignac number, because none of the positive numbers 2^k-90591599 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 (90591593) 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, 6470822 + ... + 6470835.

It is an arithmetic number, because the mean of its divisors is an integer number (25883316).

Almost surely, 2^90591599 is an apocalyptic number.

90591599 is a deficient number, since it is larger than the sum of its proper divisors (12941665).

90591599 is a wasteful number, since it uses less digits than its factorization.

90591599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12941664.

The product of its (nonzero) digits is 164025, while the sum is 47.

The square root of 90591599 is about 9517.9619141915. The cubic root of 90591599 is about 449.1202548912.

The spelling of 90591599 in words is "ninety million, five hundred ninety-one thousand, five hundred ninety-nine".