90091213 has 2 divisors, whose sum is σ = 90091214. Its totient is φ = 90091212.

The previous prime is 90091201. The next prime is 90091219. The reversal of 90091213 is 31219009.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85710564 + 4380649 = 9258^2 + 2093^2 .

It is a cyclic number.

It is not a de Polignac number, because 90091213 - 2⁵ = 90091181 is a prime.

It is a super-2 number, since 2×90091213² = 16232853319622738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90091219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45045606 + 45045607.

It is an arithmetic number, because the mean of its divisors is an integer number (45045607).

Almost surely, 2^90091213 is an apocalyptic number.

It is an amenable number.

90091213 is a deficient number, since it is larger than the sum of its proper divisors (1).

90091213 is an equidigital number, since it uses as much as digits as its factorization.

90091213 is an odious number, because the sum of its binary digits is odd.

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

The square root of 90091213 is about 9491.6391102907. The cubic root of 90091213 is about 448.2918170106.

The spelling of 90091213 in words is "ninety million, ninety-one thousand, two hundred thirteen".