90858913 has 4 divisors (see below), whose sum is σ = 92138688. Its totient is φ = 89579140.

The previous prime is 90858869. The next prime is 90858919. The reversal of 90858913 is 31985809.

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 90858913 - 2¹⁷ = 90727841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90858913.

It is not an unprimeable number, because it can be changed into a prime (90858919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 639781 + ... + 639922.

It is an arithmetic number, because the mean of its divisors is an integer number (23034672).

Almost surely, 2^90858913 is an apocalyptic number.

It is an amenable number.

90858913 is a deficient number, since it is larger than the sum of its proper divisors (1279775).

90858913 is a wasteful number, since it uses less digits than its factorization.

90858913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279774.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 90858913 is about 9531.9941775056. The cubic root of 90858913 is about 449.5615696885.

The spelling of 90858913 in words is "ninety million, eight hundred fifty-eight thousand, nine hundred thirteen".