90910213 has 4 divisors (see below), whose sum is σ = 93024448. Its totient is φ = 88795980.

The previous prime is 90910189. The next prime is 90910217. The reversal of 90910213 is 31201909.

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 a de Polignac number, because none of the positive numbers 2^k-90910213 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 (90910217) 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, 1057053 + ... + 1057138.

It is an arithmetic number, because the mean of its divisors is an integer number (23256112).

Almost surely, 2^90910213 is an apocalyptic number.

It is an amenable number.

90910213 is a deficient number, since it is larger than the sum of its proper divisors (2114235).

90910213 is a wasteful number, since it uses less digits than its factorization.

90910213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2114234.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 90910213 is about 9534.6847352180. The cubic root of 90910213 is about 449.6461630016.

The spelling of 90910213 in words is "ninety million, nine hundred ten thousand, two hundred thirteen".