90156161 has 4 divisors (see below), whose sum is σ = 92592852. Its totient is φ = 87719472.

The previous prime is 90156139. The next prime is 90156173. The reversal of 90156161 is 16165109.

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 67650625 + 22505536 = 8225^2 + 4744^2 .

It is a cyclic number.

It is not a de Polignac number, because 90156161 - 2⁶ = 90156097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90156181) 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, 1218290 + ... + 1218363.

It is an arithmetic number, because the mean of its divisors is an integer number (23148213).

Almost surely, 2^90156161 is an apocalyptic number.

It is an amenable number.

90156161 is a deficient number, since it is larger than the sum of its proper divisors (2436691).

90156161 is a wasteful number, since it uses less digits than its factorization.

90156161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2436690.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 90156161 is about 9495.0598207700. The cubic root of 90156161 is about 448.3995177217.

The spelling of 90156161 in words is "ninety million, one hundred fifty-six thousand, one hundred sixty-one".