90461581 has 4 divisors (see below), whose sum is σ = 103384672. Its totient is φ = 77538492.

The previous prime is 90461563. The next prime is 90461639. The reversal of 90461581 is 18516409.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90461581 - 2⁵ = 90461549 is a prime.

It is a super-2 number, since 2×90461581² = 16366595274039122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90461081) 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 in 3 ways as a sum of consecutive naturals, for example, 6461535 + ... + 6461548.

It is an arithmetic number, because the mean of its divisors is an integer number (25846168).

Almost surely, 2^90461581 is an apocalyptic number.

It is an amenable number.

90461581 is a deficient number, since it is larger than the sum of its proper divisors (12923091).

90461581 is a wasteful number, since it uses less digits than its factorization.

90461581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12923090.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 90461581 is about 9511.1293230615. The cubic root of 90461581 is about 448.9052913405.

The spelling of 90461581 in words is "ninety million, four hundred sixty-one thousand, five hundred eighty-one".