31739129 has 2 divisors, whose sum is σ = 31739130. Its totient is φ = 31739128.

The previous prime is 31739087. The next prime is 31739131. The reversal of 31739129 is 92193713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25603600 + 6135529 = 5060^2 + 2477^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31739129 is a prime.

Together with 31739131, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31739179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15869564 + 15869565.

It is an arithmetic number, because the mean of its divisors is an integer number (15869565).

Almost surely, 2^31739129 is an apocalyptic number.

It is an amenable number.

31739129 is a deficient number, since it is larger than the sum of its proper divisors (1).

31739129 is an equidigital number, since it uses as much as digits as its factorization.

31739129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 35.

The square root of 31739129 is about 5633.7491069447. The cubic root of 31739129 is about 316.6151326419.

The spelling of 31739129 in words is "thirty-one million, seven hundred thirty-nine thousand, one hundred twenty-nine".