31129999999 has 4 divisors (see below), whose sum is σ = 35577142864. Its totient is φ = 26682857136.

The previous prime is 31129999981. The next prime is 31130000147. The reversal of 31129999999 is 99999992113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31129999999 - 2¹⁷ = 31129868927 is a prime.

It is a Duffinian number.

31129999999 is a modest number, since divided by 999999 gives 31129 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31129999499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2223571422 + ... + 2223571435.

It is an arithmetic number, because the mean of its divisors is an integer number (8894285716).

Almost surely, 2^31129999999 is an apocalyptic number.

31129999999 is a deficient number, since it is larger than the sum of its proper divisors (4447142865).

31129999999 is an equidigital number, since it uses as much as digits as its factorization.

31129999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4447142864.

The product of its digits is 28697814, while the sum is 70.

The spelling of 31129999999 in words is "thirty-one billion, one hundred twenty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".