90769181 has 4 divisors (see below), whose sum is σ = 90907164. Its totient is φ = 90631200.

The previous prime is 90769127. The next prime is 90769187. The reversal of 90769181 is 18196709.

It is a happy number.

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 76405081 + 14364100 = 8741^2 + 3790^2 .

It is a cyclic number.

It is not a de Polignac number, because 90769181 - 2⁶ = 90769117 is a prime.

It is a super-2 number, since 2×90769181² = 16478088438821522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90769187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68000 + ... + 69321.

It is an arithmetic number, because the mean of its divisors is an integer number (22726791).

Almost surely, 2^90769181 is an apocalyptic number.

It is an amenable number.

90769181 is a deficient number, since it is larger than the sum of its proper divisors (137983).

90769181 is a wasteful number, since it uses less digits than its factorization.

90769181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137982.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 90769181 is about 9527.2861298483. The cubic root of 90769181 is about 449.4135257060.

The spelling of 90769181 in words is "ninety million, seven hundred sixty-nine thousand, one hundred eighty-one".