90281172991 has 8 divisors (see below), whose sum is σ = 90790631568. Its totient is φ = 89771832000.

The previous prime is 90281172983. The next prime is 90281173051. The reversal of 90281172991 is 19927118209.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90281172991 - 2³ = 90281172983 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 (90281173991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1845771 + ... + 1894051.

It is an arithmetic number, because the mean of its divisors is an integer number (11348828946).

Almost surely, 2^90281172991 is an apocalyptic number.

90281172991 is a deficient number, since it is larger than the sum of its proper divisors (509458577).

90281172991 is a wasteful number, since it uses less digits than its factorization.

90281172991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58793.

The product of its (nonzero) digits is 163296, while the sum is 49.

The spelling of 90281172991 in words is "ninety billion, two hundred eighty-one million, one hundred seventy-two thousand, nine hundred ninety-one".