3131661999 has 16 divisors (see below), whose sum is σ = 4215935232. Its totient is φ = 2067612288.

The previous prime is 3131661997. The next prime is 3131662019. The reversal of 3131661999 is 9991661313.

It is not a de Polignac number, because 3131661999 - 2¹ = 3131661997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131661997) 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, 520084 + ... + 526070.

It is an arithmetic number, because the mean of its divisors is an integer number (263495952).

Almost surely, 2^3131661999 is an apocalyptic number.

3131661999 is a deficient number, since it is larger than the sum of its proper divisors (1084273233).

3131661999 is a wasteful number, since it uses less digits than its factorization.

3131661999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7646.

The product of its digits is 236196, while the sum is 48.

The square root of 3131661999 is about 55961.2544444815. The cubic root of 3131661999 is about 1463.0470545471.

The spelling of 3131661999 in words is "three billion, one hundred thirty-one million, six hundred sixty-one thousand, nine hundred ninety-nine".