90772191331 has 4 divisors (see below), whose sum is σ = 90773655064. Its totient is φ = 90770727600.

The previous prime is 90772191329. The next prime is 90772191379. The reversal of 90772191331 is 13319127709.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90772191331 - 2¹ = 90772191329 is a prime.

It is a super-2 number, since 2×90772191331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90772191031) 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, 634530 + ... + 764311.

It is an arithmetic number, because the mean of its divisors is an integer number (22693413766).

Almost surely, 2^90772191331 is an apocalyptic number.

90772191331 is a deficient number, since it is larger than the sum of its proper divisors (1463733).

90772191331 is a wasteful number, since it uses less digits than its factorization.

90772191331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463732.

The product of its (nonzero) digits is 71442, while the sum is 43.

The spelling of 90772191331 in words is "ninety billion, seven hundred seventy-two million, one hundred ninety-one thousand, three hundred thirty-one".