31343129 has 2 divisors, whose sum is σ = 31343130. Its totient is φ = 31343128.

The previous prime is 31343119. The next prime is 31343131. The reversal of 31343129 is 92134313.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29997529 + 1345600 = 5477^2 + 1160^2 .

It is a cyclic number.

It is not a de Polignac number, because 31343129 - 2¹⁶ = 31277593 is a prime.

Together with 31343131, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31343098 and 31343107.

It is not a weakly prime, because it can be changed into another prime (31343119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15671564 + 15671565.

It is an arithmetic number, because the mean of its divisors is an integer number (15671565).

Almost surely, 2^31343129 is an apocalyptic number.

It is an amenable number.

31343129 is a deficient number, since it is larger than the sum of its proper divisors (1).

31343129 is an equidigital number, since it uses as much as digits as its factorization.

31343129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 26.

The square root of 31343129 is about 5598.4934580653. The cubic root of 31343129 is about 315.2928459993.

The spelling of 31343129 in words is "thirty-one million, three hundred forty-three thousand, one hundred twenty-nine".