31199429 has 2 divisors, whose sum is σ = 31199430. Its totient is φ = 31199428.

The previous prime is 31199411. The next prime is 31199449. The reversal of 31199429 is 92499113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26368225 + 4831204 = 5135^2 + 2198^2 .

It is a cyclic number.

It is not a de Polignac number, because 31199429 - 2⁸ = 31199173 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31199392 and 31199401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31199449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15599714 + 15599715.

It is an arithmetic number, because the mean of its divisors is an integer number (15599715).

Almost surely, 2^31199429 is an apocalyptic number.

It is an amenable number.

31199429 is a deficient number, since it is larger than the sum of its proper divisors (1).

31199429 is an equidigital number, since it uses as much as digits as its factorization.

31199429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 38.

The square root of 31199429 is about 5585.6449045746. The cubic root of 31199429 is about 314.8102628257.

The spelling of 31199429 in words is "thirty-one million, one hundred ninety-nine thousand, four hundred twenty-nine".