90493432851 has 4 divisors (see below), whose sum is σ = 120657910472. Its totient is φ = 60328955232.

The previous prime is 90493432837. The next prime is 90493432879. The reversal of 90493432851 is 15823439409.

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

It is not a de Polignac number, because 90493432851 - 2⁶ = 90493432787 is a prime.

It is a super-2 number, since 2×90493432851² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90493432851.

It is not an unprimeable number, because it can be changed into a prime (90493432801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15082238806 + ... + 15082238811.

It is an arithmetic number, because the mean of its divisors is an integer number (30164477618).

Almost surely, 2^90493432851 is an apocalyptic number.

90493432851 is a deficient number, since it is larger than the sum of its proper divisors (30164477621).

90493432851 is a wasteful number, since it uses less digits than its factorization.

90493432851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30164477620.

The product of its (nonzero) digits is 933120, while the sum is 48.

The spelling of 90493432851 in words is "ninety billion, four hundred ninety-three million, four hundred thirty-two thousand, eight hundred fifty-one".