90163661 has 4 divisors (see below), whose sum is σ = 103044192. Its totient is φ = 77283132.

The previous prime is 90163649. The next prime is 90163669. The reversal of 90163661 is 16636109.

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 a de Polignac number, because none of the positive numbers 2^k-90163661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90163669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6440255 + ... + 6440268.

It is an arithmetic number, because the mean of its divisors is an integer number (25761048).

Almost surely, 2^90163661 is an apocalyptic number.

It is an amenable number.

90163661 is a deficient number, since it is larger than the sum of its proper divisors (12880531).

90163661 is a wasteful number, since it uses less digits than its factorization.

90163661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12880530.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 90163661 is about 9495.4547547761. The cubic root of 90163661 is about 448.4119513447.

The spelling of 90163661 in words is "ninety million, one hundred sixty-three thousand, six hundred sixty-one".