90481213 has 2 divisors, whose sum is σ = 90481214. Its totient is φ = 90481212.

The previous prime is 90481207. The next prime is 90481217. The reversal of 90481213 is 31218409.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88115769 + 2365444 = 9387^2 + 1538^2 .

It is a cyclic number.

It is not a de Polignac number, because 90481213 - 2⁹ = 90480701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90481217) 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, 45240606 + 45240607.

It is an arithmetic number, because the mean of its divisors is an integer number (45240607).

Almost surely, 2^90481213 is an apocalyptic number.

It is an amenable number.

90481213 is a deficient number, since it is larger than the sum of its proper divisors (1).

90481213 is an equidigital number, since it uses as much as digits as its factorization.

90481213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 90481213 is about 9512.1613211720. The cubic root of 90481213 is about 448.9377628462.

The spelling of 90481213 in words is "ninety million, four hundred eighty-one thousand, two hundred thirteen".