90459561 has 16 divisors (see below), whose sum is σ = 124838208. Its totient is φ = 58219200.

The previous prime is 90459557. The next prime is 90459563. The reversal of 90459561 is 16595409.

It is not a de Polignac number, because 90459561 - 2² = 90459557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90459563) 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 15 ways as a sum of consecutive naturals, for example, 11431 + ... + 17651.

It is an arithmetic number, because the mean of its divisors is an integer number (7802388).

Almost surely, 2^90459561 is an apocalyptic number.

It is an amenable number.

90459561 is a deficient number, since it is larger than the sum of its proper divisors (34378647).

90459561 is a wasteful number, since it uses less digits than its factorization.

90459561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6392.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 90459561 is about 9511.0231310832. The cubic root of 90459561 is about 448.9019499757.

The spelling of 90459561 in words is "ninety million, four hundred fifty-nine thousand, five hundred sixty-one".