90730181 has 4 divisors (see below), whose sum is σ = 90781152. Its totient is φ = 90679212.

The previous prime is 90730177. The next prime is 90730217. The reversal of 90730181 is 18103709.

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 90730181 - 2² = 90730177 is a prime.

It is a super-2 number, since 2×90730181² = 16463931488585522, 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 (90730121) 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, 22715 + ... + 26408.

It is an arithmetic number, because the mean of its divisors is an integer number (22695288).

Almost surely, 2^90730181 is an apocalyptic number.

It is an amenable number.

90730181 is a deficient number, since it is larger than the sum of its proper divisors (50971).

90730181 is a wasteful number, since it uses less digits than its factorization.

90730181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50970.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 90730181 is about 9525.2391571026. The cubic root of 90730181 is about 449.3491512926.

The spelling of 90730181 in words is "ninety million, seven hundred thirty thousand, one hundred eighty-one".