90204263581 has 4 divisors (see below), whose sum is σ = 90210627072. Its totient is φ = 90197900092.

The previous prime is 90204263519. The next prime is 90204263593. The reversal of 90204263581 is 18536240209.

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 90204263581 - 2⁹ = 90204263069 is a prime.

It is a super-2 number, since 2×90204263581² (a number of 23 digits) 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 (90204243581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3160435 + ... + 3188848.

It is an arithmetic number, because the mean of its divisors is an integer number (22552656768).

Almost surely, 2^90204263581 is an apocalyptic number.

It is an amenable number.

90204263581 is a deficient number, since it is larger than the sum of its proper divisors (6363491).

90204263581 is a wasteful number, since it uses less digits than its factorization.

90204263581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6363490.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 90204263581 in words is "ninety billion, two hundred four million, two hundred sixty-three thousand, five hundred eighty-one".