819890985831 has 16 divisors (see below), whose sum is σ = 1167899184000. Its totient is φ = 510097138848.

The previous prime is 819890985817. The next prime is 819890985883. The reversal of 819890985831 is 138589098918.

It is not a de Polignac number, because 819890985831 - 2⁵ = 819890985799 is a prime.

It is a super-2 number, since 2×819890985831² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819890985131) 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, 107339856 + ... + 107347493.

It is an arithmetic number, because the mean of its divisors is an integer number (72993699000).

Almost surely, 2^819890985831 is an apocalyptic number.

819890985831 is a deficient number, since it is larger than the sum of its proper divisors (348008198169).

819890985831 is a wasteful number, since it uses less digits than its factorization.

819890985831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214687438.

The product of its (nonzero) digits is 44789760, while the sum is 69.

The spelling of 819890985831 in words is "eight hundred nineteen billion, eight hundred ninety million, nine hundred eighty-five thousand, eight hundred thirty-one".