90506181 has 16 divisors (see below), whose sum is σ = 131229504. Its totient is φ = 55252224.

The previous prime is 90506167. The next prime is 90506183. The reversal of 90506181 is 18160509.

It is a happy number.

It is not a de Polignac number, because 90506181 - 2¹⁰ = 90505157 is a prime.

It is a super-2 number, since 2×90506181² = 16382737598409522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90506183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22095 + ... + 25868.

It is an arithmetic number, because the mean of its divisors is an integer number (8201844).

Almost surely, 2^90506181 is an apocalyptic number.

It is an amenable number.

90506181 is a deficient number, since it is larger than the sum of its proper divisors (40723323).

90506181 is a wasteful number, since it uses less digits than its factorization.

90506181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48020.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 90506181 is about 9513.4736558210. The cubic root of 90506181 is about 448.9790533595.

The spelling of 90506181 in words is "ninety million, five hundred six thousand, one hundred eighty-one".