199912031 has 12 divisors (see below), whose sum is σ = 223298280. Its totient is φ = 177493680.

The previous prime is 199911997. The next prime is 199912081. The reversal of 199912031 is 130219991.

It is a de Polignac number, because none of the positive numbers 2^k-199912031 is a prime.

It is a super-2 number, since 2×199912031² = 79929640277089922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199911982 and 199912000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199912081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15425 + ... + 25253.

It is an arithmetic number, because the mean of its divisors is an integer number (18608190).

Almost surely, 2^199912031 is an apocalyptic number.

199912031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

199912031 is a deficient number, since it is larger than the sum of its proper divisors (23386249).

199912031 is an equidigital number, since it uses as much as digits as its factorization.

199912031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9926 (or 9883 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 199912031 is about 14139.0251078354. The cubic root of 199912031 is about 584.7177940965.

It can be divided in two parts, 19991 and 2031, that added together give a palindrome (22022).

The spelling of 199912031 in words is "one hundred ninety-nine million, nine hundred twelve thousand, thirty-one".