90358181 has 4 divisors (see below), whose sum is σ = 92800332. Its totient is φ = 87916032.

The previous prime is 90358157. The next prime is 90358193. The reversal of 90358181 is 18185309.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18185309 = 577 ⋅31517.

It can be written as a sum of positive squares in 2 ways, for example, as 36409156 + 53949025 = 6034^2 + 7345^2 .

It is a cyclic number.

It is not a de Polignac number, because 90358181 - 2⁶ = 90358117 is a prime.

It is a super-2 number, since 2×90358181² = 16329201747257522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90351181) 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, 1221020 + ... + 1221093.

It is an arithmetic number, because the mean of its divisors is an integer number (23200083).

Almost surely, 2^90358181 is an apocalyptic number.

It is an amenable number.

90358181 is a deficient number, since it is larger than the sum of its proper divisors (2442151).

90358181 is a wasteful number, since it uses less digits than its factorization.

90358181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442150.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 90358181 is about 9505.6920316198. The cubic root of 90358181 is about 448.7341892253.

The spelling of 90358181 in words is "ninety million, three hundred fifty-eight thousand, one hundred eighty-one".