31331429 has 2 divisors, whose sum is σ = 31331430. Its totient is φ = 31331428.

The previous prime is 31331407. The next prime is 31331431. The reversal of 31331429 is 92413313.

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., 25230529 + 6100900 = 5023^2 + 2470^2 .

It is a cyclic number.

It is not a de Polignac number, because 31331429 - 2²⁰ = 30282853 is a prime.

Together with 31331431, 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 = 31331398 and 31331407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31331029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15665714 + 15665715.

It is an arithmetic number, because the mean of its divisors is an integer number (15665715).

Almost surely, 2^31331429 is an apocalyptic number.

It is an amenable number.

31331429 is a deficient number, since it is larger than the sum of its proper divisors (1).

31331429 is an equidigital number, since it uses as much as digits as its factorization.

31331429 is an odious number, because the sum of its binary digits is odd.

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

The square root of 31331429 is about 5597.4484365646. The cubic root of 31331429 is about 315.2536094848.

The spelling of 31331429 in words is "thirty-one million, three hundred thirty-one thousand, four hundred twenty-nine".