31142719729 has 27 divisors (see below), whose sum is σ = 34934450187. Its totient is φ = 27741555600.

The previous prime is 31142719717. The next prime is 31142719759. The reversal of 31142719729 is 92791724113.

The square root of 31142719729 is 176473.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1012703329 + 30130016400 = 31823^2 + 173580^2 .

It is not a de Polignac number, because 31142719729 - 2⁵ = 31142719697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31142719759) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 118413252 + ... + 118413514.

Almost surely, 2^31142719729 is an apocalyptic number.

31142719729 is the 176473-rd square number.

31142719729 is the 88237-th centered octagonal number.

It is an amenable number.

31142719729 is a deficient number, since it is larger than the sum of its proper divisors (3791730458).

31142719729 is an frugal number, since it uses more digits than its factorization.

31142719729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670 (or 335 counting only the distinct ones).

The product of its digits is 190512, while the sum is 46.

The spelling of 31142719729 in words is "thirty-one billion, one hundred forty-two million, seven hundred nineteen thousand, seven hundred twenty-nine".