31321492129 has 2 divisors, whose sum is σ = 31321492130. Its totient is φ = 31321492128.

The previous prime is 31321492109. The next prime is 31321492133. The reversal of 31321492129 is 92129412313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18009640000 + 13311852129 = 134200^2 + 115377^2 .

It is a cyclic number.

It is not a de Polignac number, because 31321492129 - 2¹⁵ = 31321459361 is a prime.

It is not a weakly prime, because it can be changed into another prime (31321492109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660746064 + 15660746065.

It is an arithmetic number, because the mean of its divisors is an integer number (15660746065).

Almost surely, 2^31321492129 is an apocalyptic number.

It is an amenable number.

31321492129 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321492129 is an equidigital number, since it uses as much as digits as its factorization.

31321492129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 37.

The spelling of 31321492129 in words is "thirty-one billion, three hundred twenty-one million, four hundred ninety-two thousand, one hundred twenty-nine".