90242213 has 2 divisors, whose sum is σ = 90242214. Its totient is φ = 90242212.

The previous prime is 90242203. The next prime is 90242219. The reversal of 90242213 is 31224209.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65966884 + 24275329 = 8122^2 + 4927^2 .

It is an emirp because it is prime and its reverse (31224209) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90242213 - 2¹⁰ = 90241189 is a prime.

It is equal to p_5230265 and since 90242213 and 5230265 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90242219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45121106 + 45121107.

It is an arithmetic number, because the mean of its divisors is an integer number (45121107).

Almost surely, 2^90242213 is an apocalyptic number.

It is an amenable number.

90242213 is a deficient number, since it is larger than the sum of its proper divisors (1).

90242213 is an equidigital number, since it uses as much as digits as its factorization.

90242213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 90242213 is about 9499.5901490538. The cubic root of 90242213 is about 448.5421347283.

The spelling of 90242213 in words is "ninety million, two hundred forty-two thousand, two hundred thirteen".