20131131199 has 16 divisors (see below), whose sum is σ = 22465454080. Its totient is φ = 17957544480.

The previous prime is 20131131197. The next prime is 20131131203. The reversal of 20131131199 is 99113113102.

It is not a de Polignac number, because 20131131199 - 2¹ = 20131131197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 20131131199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131131197) 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 15 ways as a sum of consecutive naturals, for example, 440079 + ... + 483664.

It is an arithmetic number, because the mean of its divisors is an integer number (1404090880).

Almost surely, 2^20131131199 is an apocalyptic number.

20131131199 is a deficient number, since it is larger than the sum of its proper divisors (2334322881).

20131131199 is a wasteful number, since it uses less digits than its factorization.

20131131199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923830.

The product of its (nonzero) digits is 1458, while the sum is 31.

The spelling of 20131131199 in words is "twenty billion, one hundred thirty-one million, one hundred thirty-one thousand, one hundred ninety-nine".