90194857231 has 16 divisors (see below), whose sum is σ = 95524558560. Its totient is φ = 84924979200.

The previous prime is 90194857211. The next prime is 90194857243. The reversal of 90194857231 is 13275849109.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 90194857231 - 2¹³ = 90194849039 is a prime.

It is a super-2 number, since 2×90194857231² (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 (90194857211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2089095 + ... + 2131831.

It is an arithmetic number, because the mean of its divisors is an integer number (5970284910).

Almost surely, 2^90194857231 is an apocalyptic number.

90194857231 is a deficient number, since it is larger than the sum of its proper divisors (5329701329).

90194857231 is a wasteful number, since it uses less digits than its factorization.

90194857231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43434.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 90194857231 in words is "ninety billion, one hundred ninety-four million, eight hundred fifty-seven thousand, two hundred thirty-one".