90199913 has 2 divisors, whose sum is σ = 90199914. Its totient is φ = 90199912.

The previous prime is 90199871. The next prime is 90199927. The reversal of 90199913 is 31999109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86620249 + 3579664 = 9307^2 + 1892^2 .

It is an emirp because it is prime and its reverse (31999109) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90199913 - 2¹² = 90195817 is a prime.

It is not a weakly prime, because it can be changed into another prime (90199313) 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, 45099956 + 45099957.

It is an arithmetic number, because the mean of its divisors is an integer number (45099957).

Almost surely, 2^90199913 is an apocalyptic number.

It is an amenable number.

90199913 is a deficient number, since it is larger than the sum of its proper divisors (1).

90199913 is an equidigital number, since it uses as much as digits as its factorization.

90199913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19683, while the sum is 41.

The square root of 90199913 is about 9497.3634762496. The cubic root of 90199913 is about 448.4720407854.

The spelling of 90199913 in words is "ninety million, one hundred ninety-nine thousand, nine hundred thirteen".