90105913 has 4 divisors (see below), whose sum is σ = 90146020. Its totient is φ = 90065808.

The previous prime is 90105907. The next prime is 90105931. The reversal of 90105913 is 31950109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31950109 = 2203 ⋅14503.

It can be written as a sum of positive squares in 2 ways, for example, as 62773929 + 27331984 = 7923^2 + 5228^2 .

It is a cyclic number.

It is not a de Polignac number, because 90105913 - 2⁹ = 90105401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90105013) 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, 16470 + ... + 21247.

It is an arithmetic number, because the mean of its divisors is an integer number (22536505).

Almost surely, 2^90105913 is an apocalyptic number.

It is an amenable number.

90105913 is a deficient number, since it is larger than the sum of its proper divisors (40107).

90105913 is a wasteful number, since it uses less digits than its factorization.

90105913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40106.

The product of its (nonzero) digits is 1215, while the sum is 28.

The square root of 90105913 is about 9492.4134444302. The cubic root of 90105913 is about 448.3161979727.

The spelling of 90105913 in words is "ninety million, one hundred five thousand, nine hundred thirteen".