90181093 has 4 divisors (see below), whose sum is σ = 90238348. Its totient is φ = 90123840.

The previous prime is 90181081. The next prime is 90181121. The reversal of 90181093 is 39018109.

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 37429924 + 52751169 = 6118^2 + 7263^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90181093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90181193) 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, 26196 + ... + 29437.

It is an arithmetic number, because the mean of its divisors is an integer number (22559587).

Almost surely, 2^90181093 is an apocalyptic number.

It is an amenable number.

90181093 is a deficient number, since it is larger than the sum of its proper divisors (57255).

90181093 is a wasteful number, since it uses less digits than its factorization.

90181093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57254.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 90181093 is about 9496.3726232704. The cubic root of 90181093 is about 448.4408477365.

The spelling of 90181093 in words is "ninety million, one hundred eighty-one thousand, ninety-three".