90561577 has 8 divisors (see below), whose sum is σ = 95453640. Its totient is φ = 85787520.

The previous prime is 90561563. The next prime is 90561593. The reversal of 90561577 is 77516509.

It can be written as a sum of positive squares in 4 ways, for example, as 13402921 + 77158656 = 3661^2 + 8784^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90561577 - 2²³ = 82172969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90561547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27924 + ... + 30997.

It is an arithmetic number, because the mean of its divisors is an integer number (11931705).

Almost surely, 2^90561577 is an apocalyptic number.

It is an amenable number.

90561577 is a deficient number, since it is larger than the sum of its proper divisors (4892063).

90561577 is a wasteful number, since it uses less digits than its factorization.

90561577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59003.

The product of its (nonzero) digits is 66150, while the sum is 40.

The square root of 90561577 is about 9516.3846601532. The cubic root of 90561577 is about 449.0706366846.

The spelling of 90561577 in words is "ninety million, five hundred sixty-one thousand, five hundred seventy-seven".