31321527129 has 12 divisors (see below), whose sum is σ = 45376460116. Its totient is φ = 20819054592.

The previous prime is 31321527109. The next prime is 31321527143. The reversal of 31321527129 is 92172512313.

It is a happy number.

31321527129 is a `hidden beast` number, since 3 + 1 + 3 + 2 + 1 + 527 + 129 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4867155225 + 26454371904 = 69765^2 + 162648^2 .

It is not a de Polignac number, because 31321527129 - 2⁹ = 31321526617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31321527093 and 31321527102.

It is not an unprimeable number, because it can be changed into a prime (31321527109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5160424 + ... + 5166489.

Almost surely, 2^31321527129 is an apocalyptic number.

It is an amenable number.

31321527129 is a deficient number, since it is larger than the sum of its proper divisors (14054932987).

31321527129 is a wasteful number, since it uses less digits than its factorization.

31321527129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10327256 (or 10327253 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The spelling of 31321527129 in words is "thirty-one billion, three hundred twenty-one million, five hundred twenty-seven thousand, one hundred twenty-nine".