90197213 has 2 divisors, whose sum is σ = 90197214. Its totient is φ = 90197212.

The previous prime is 90197207. The next prime is 90197227. The reversal of 90197213 is 31279109.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88604569 + 1592644 = 9413^2 + 1262^2 .

It is an emirp because it is prime and its reverse (31279109) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90197213 - 2²⁶ = 23088349 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 90197213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90197243) 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 as a sum of consecutive naturals, namely, 45098606 + 45098607.

It is an arithmetic number, because the mean of its divisors is an integer number (45098607).

Almost surely, 2^90197213 is an apocalyptic number.

It is an amenable number.

90197213 is a deficient number, since it is larger than the sum of its proper divisors (1).

90197213 is an equidigital number, since it uses as much as digits as its factorization.

90197213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 90197213 is about 9497.2213304735. The cubic root of 90197213 is about 448.4675659600.

The spelling of 90197213 in words is "ninety million, one hundred ninety-seven thousand, two hundred thirteen".