90123599 has 4 divisors (see below), whose sum is σ = 90321264. Its totient is φ = 89925936.

The previous prime is 90123587. The next prime is 90123611. The reversal of 90123599 is 99532109.

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

It is an interprime number because it is at equal distance from previous prime (90123587) and next prime (90123611).

It is a cyclic number.

It is not a de Polignac number, because 90123599 - 2²⁰ = 89075023 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 (90123529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98147 + ... + 99060.

It is an arithmetic number, because the mean of its divisors is an integer number (22580316).

Almost surely, 2^90123599 is an apocalyptic number.

90123599 is a deficient number, since it is larger than the sum of its proper divisors (197665).

90123599 is a wasteful number, since it uses less digits than its factorization.

90123599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197664.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 90123599 is about 9493.3449847775. The cubic root of 90123599 is about 448.3455279071.

The spelling of 90123599 in words is "ninety million, one hundred twenty-three thousand, five hundred ninety-nine".