90587561 has 4 divisors (see below), whose sum is σ = 93711300. Its totient is φ = 87463824.

The previous prime is 90587537. The next prime is 90587569. The reversal of 90587561 is 16578509.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52998400 + 37589161 = 7280^2 + 6131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90587561 is a prime.

It is a super-2 number, since 2×90587561² = 16412212415857442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90587569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1561826 + ... + 1561883.

It is an arithmetic number, because the mean of its divisors is an integer number (23427825).

Almost surely, 2^90587561 is an apocalyptic number.

It is an amenable number.

90587561 is a deficient number, since it is larger than the sum of its proper divisors (3123739).

90587561 is a wasteful number, since it uses less digits than its factorization.

90587561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123738.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 90587561 is about 9517.7497865830. The cubic root of 90587561 is about 449.1135818128.

The spelling of 90587561 in words is "ninety million, five hundred eighty-seven thousand, five hundred sixty-one".