1999997131 has 16 divisors (see below), whose sum is σ = 2286950400. Its totient is φ = 1731280320.

The previous prime is 1999997117. The next prime is 1999997141. The reversal of 1999997131 is 1317999991.

It is not a de Polignac number, because 1999997131 - 2⁹ = 1999996619 is a prime.

It is a super-2 number, since 2×1999997131² = 7999977048016462322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1999997141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38695 + ... + 74143.

It is an arithmetic number, because the mean of its divisors is an integer number (142934400).

Almost surely, 2^1999997131 is an apocalyptic number.

1999997131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1999997131 is a deficient number, since it is larger than the sum of its proper divisors (286953269).

1999997131 is a wasteful number, since it uses less digits than its factorization.

1999997131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35706.

The product of its digits is 1240029, while the sum is 58.

The square root of 1999997131 is about 44721.3274735892. The cubic root of 1999997131 is about 1259.9204474423.

It can be divided in two parts, 19999971 and 31, that added together give a palindrome (20000002).

The spelling of 1999997131 in words is "one billion, nine hundred ninety-nine million, nine hundred ninety-seven thousand, one hundred thirty-one".