90150581 has 2 divisors, whose sum is σ = 90150582. Its totient is φ = 90150580.

The previous prime is 90150563. The next prime is 90150583. The reversal of 90150581 is 18505109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74476900 + 15673681 = 8630^2 + 3959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90150581 is a prime.

It is a super-2 number, since 2×90150581² = 16254254509275122, which contains 22 as substring.

Together with 90150583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90150583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45075290 + 45075291.

It is an arithmetic number, because the mean of its divisors is an integer number (45075291).

Almost surely, 2^90150581 is an apocalyptic number.

It is an amenable number.

90150581 is a deficient number, since it is larger than the sum of its proper divisors (1).

90150581 is an equidigital number, since it uses as much as digits as its factorization.

90150581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 90150581 is about 9494.7659792119. The cubic root of 90150581 is about 448.3902666589.

The spelling of 90150581 in words is "ninety million, one hundred fifty thousand, five hundred eighty-one".