90219913 has 16 divisors (see below), whose sum is σ = 105283584. Its totient is φ = 75715920.

The previous prime is 90219907. The next prime is 90219917. The reversal of 90219913 is 31991209.

It is not a de Polignac number, because 90219913 - 2⁵ = 90219881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90219917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82456 + ... + 83542.

It is an arithmetic number, because the mean of its divisors is an integer number (6580224).

Almost surely, 2^90219913 is an apocalyptic number.

It is an amenable number.

90219913 is a deficient number, since it is larger than the sum of its proper divisors (15063671).

90219913 is a wasteful number, since it uses less digits than its factorization.

90219913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 90219913 is about 9498.4163416856. The cubic root of 90219913 is about 448.5051848601.

The spelling of 90219913 in words is "ninety million, two hundred nineteen thousand, nine hundred thirteen".