31660429 has 2 divisors, whose sum is σ = 31660430. Its totient is φ = 31660428.

The previous prime is 31660423. The next prime is 31660439. The reversal of 31660429 is 92406613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29975625 + 1684804 = 5475^2 + 1298^2 .

It is a cyclic number.

It is not a de Polignac number, because 31660429 - 2⁷ = 31660301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31660429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31660423) 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, 15830214 + 15830215.

It is an arithmetic number, because the mean of its divisors is an integer number (15830215).

Almost surely, 2^31660429 is an apocalyptic number.

It is an amenable number.

31660429 is a deficient number, since it is larger than the sum of its proper divisors (1).

31660429 is an equidigital number, since it uses as much as digits as its factorization.

31660429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 31660429 is about 5626.7600801882. The cubic root of 31660429 is about 316.3532242311.

The spelling of 31660429 in words is "thirty-one million, six hundred sixty thousand, four hundred twenty-nine".