90336581 has 2 divisors, whose sum is σ = 90336582. Its totient is φ = 90336580.

The previous prime is 90336563. The next prime is 90336599. The reversal of 90336581 is 18563309.

It is a balanced prime because it is at equal distance from previous prime (90336563) and next prime (90336599).

It can be written as a sum of positive squares in only one way, i.e., 78605956 + 11730625 = 8866^2 + 3425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90336581 is a prime.

It is a super-2 number, since 2×90336581² = 16321395733539122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90336541) 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, 45168290 + 45168291.

It is an arithmetic number, because the mean of its divisors is an integer number (45168291).

Almost surely, 2^90336581 is an apocalyptic number.

It is an amenable number.

90336581 is a deficient number, since it is larger than the sum of its proper divisors (1).

90336581 is an equidigital number, since it uses as much as digits as its factorization.

90336581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 90336581 is about 9504.5558023508. Note that the first 3 decimals coincide. The cubic root of 90336581 is about 448.6984299436.

The spelling of 90336581 in words is "ninety million, three hundred thirty-six thousand, five hundred eighty-one".