31429309 has 2 divisors, whose sum is σ = 31429310. Its totient is φ = 31429308.

The previous prime is 31429303. The next prime is 31429313. The reversal of 31429309 is 90392413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17665209 + 13764100 = 4203^2 + 3710^2 .

It is a cyclic number.

It is not a de Polignac number, because 31429309 - 2⁹ = 31428797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31429303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15714654 + 15714655.

It is an arithmetic number, because the mean of its divisors is an integer number (15714655).

Almost surely, 2^31429309 is an apocalyptic number.

It is an amenable number.

31429309 is a deficient number, since it is larger than the sum of its proper divisors (1).

31429309 is an equidigital number, since it uses as much as digits as its factorization.

31429309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 31429309 is about 5606.1848881392. The cubic root of 31429309 is about 315.5815543768.

The spelling of 31429309 in words is "thirty-one million, four hundred twenty-nine thousand, three hundred nine".