90229181 has 4 divisors (see below), whose sum is σ = 103119072. Its totient is φ = 77339292.

The previous prime is 90229171. The next prime is 90229193. The reversal of 90229181 is 18192209.

It is a happy number.

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 90229181 - 2¹⁰ = 90228157 is a prime.

It is a super-2 number, since 2×90229181² = 16282610207861522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90229171) 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, 6444935 + ... + 6444948.

It is an arithmetic number, because the mean of its divisors is an integer number (25779768).

Almost surely, 2^90229181 is an apocalyptic number.

It is an amenable number.

90229181 is a deficient number, since it is larger than the sum of its proper divisors (12889891).

90229181 is a wasteful number, since it uses less digits than its factorization.

90229181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12889890.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 90229181 is about 9498.9041999591. The cubic root of 90229181 is about 448.5205421635.

The spelling of 90229181 in words is "ninety million, two hundred twenty-nine thousand, one hundred eighty-one".