90656161 has 4 divisors (see below), whose sum is σ = 91162800. Its totient is φ = 90149524.

The previous prime is 90656149. The next prime is 90656177. The reversal of 90656161 is 16165609.

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 90656161 - 2²³ = 82267553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90656101) 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, 253051 + ... + 253408.

It is an arithmetic number, because the mean of its divisors is an integer number (22790700).

Almost surely, 2^90656161 is an apocalyptic number.

It is an amenable number.

90656161 is a deficient number, since it is larger than the sum of its proper divisors (506639).

90656161 is a wasteful number, since it uses less digits than its factorization.

90656161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506638.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 90656161 is about 9521.3528975666. The cubic root of 90656161 is about 449.2269212073.

The spelling of 90656161 in words is "ninety million, six hundred fifty-six thousand, one hundred sixty-one".