90756312791 has 4 divisors (see below), whose sum is σ = 90859328784. Its totient is φ = 90653296800.

The previous prime is 90756312769. The next prime is 90756312793. The reversal of 90756312791 is 19721365709.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19721365709 = 23 ⋅857450683.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90756312791 is a prime.

It is a super-2 number, since 2×90756312791² (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 (90756312793) 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 3 ways as a sum of consecutive naturals, for example, 51506675 + ... + 51508436.

It is an arithmetic number, because the mean of its divisors is an integer number (22714832196).

Almost surely, 2^90756312791 is an apocalyptic number.

90756312791 is a deficient number, since it is larger than the sum of its proper divisors (103015993).

90756312791 is a wasteful number, since it uses less digits than its factorization.

90756312791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103015992.

The product of its (nonzero) digits is 714420, while the sum is 50.

The spelling of 90756312791 in words is "ninety billion, seven hundred fifty-six million, three hundred twelve thousand, seven hundred ninety-one".