90051859 has 4 divisors (see below), whose sum is σ = 91967904. Its totient is φ = 88135816.

The previous prime is 90051853. The next prime is 90051883. The reversal of 90051859 is 95815009.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95815009 = 17 ⋅5636177.

It is a cyclic number.

It is not a de Polignac number, because 90051859 - 2⁵ = 90051827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90051853) 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, 957952 + ... + 958045.

It is an arithmetic number, because the mean of its divisors is an integer number (22991976).

Almost surely, 2^90051859 is an apocalyptic number.

90051859 is a deficient number, since it is larger than the sum of its proper divisors (1916045).

90051859 is a wasteful number, since it uses less digits than its factorization.

90051859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1916044.

The product of its (nonzero) digits is 16200, while the sum is 37.

The square root of 90051859 is about 9489.5657961785. The cubic root of 90051859 is about 448.2265326356.

The spelling of 90051859 in words is "ninety million, fifty-one thousand, eight hundred fifty-nine".