90606561 has 4 divisors (see below), whose sum is σ = 120808752. Its totient is φ = 60404372.

The previous prime is 90606559. The next prime is 90606563. The reversal of 90606561 is 16560609.

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 an interprime number because it is at equal distance from previous prime (90606559) and next prime (90606563).

It is a cyclic number.

It is not a de Polignac number, because 90606561 - 2¹ = 90606559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90606563) 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, 15101091 + ... + 15101096.

It is an arithmetic number, because the mean of its divisors is an integer number (30202188).

Almost surely, 2^90606561 is an apocalyptic number.

It is an amenable number.

90606561 is a deficient number, since it is larger than the sum of its proper divisors (30202191).

90606561 is a wasteful number, since it uses less digits than its factorization.

90606561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30202190.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 90606561 is about 9518.7478693366. The cubic root of 90606561 is about 449.1449789179.

It can be divided in two parts, 90 and 606561, that added together give a triangular number (606651 = T₁₁₀₁).

The spelling of 90606561 in words is "ninety million, six hundred six thousand, five hundred sixty-one".