16394847931 has 24 divisors (see below), whose sum is σ = 20726528480. Its totient is φ = 12693732480.

The previous prime is 16394847913. The next prime is 16394848021. The reversal of 16394847931 is 13974849361.

It is not a de Polignac number, because 16394847931 - 2¹³ = 16394839739 is a prime.

It is a super-2 number, since 2×16394847931² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16394847901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71335 + ... + 194623.

Almost surely, 2^16394847931 is an apocalyptic number.

16394847931 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16394847931 is a deficient number, since it is larger than the sum of its proper divisors (4331680549).

16394847931 is a wasteful number, since it uses less digits than its factorization.

16394847931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123475 (or 123464 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 55.

The spelling of 16394847931 in words is "sixteen billion, three hundred ninety-four million, eight hundred forty-seven thousand, nine hundred thirty-one".