31368409 has 2 divisors, whose sum is σ = 31368410. Its totient is φ = 31368408.

The previous prime is 31368397. The next prime is 31368413. The reversal of 31368409 is 90486313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20903184 + 10465225 = 4572^2 + 3235^2 .

It is a cyclic number.

It is not a de Polignac number, because 31368409 - 2¹⁷ = 31237337 is a prime.

It is not a weakly prime, because it can be changed into another prime (31368419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15684204 + 15684205.

It is an arithmetic number, because the mean of its divisors is an integer number (15684205).

Almost surely, 2^31368409 is an apocalyptic number.

It is an amenable number.

31368409 is a deficient number, since it is larger than the sum of its proper divisors (1).

31368409 is an equidigital number, since it uses as much as digits as its factorization.

31368409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 31368409 is about 5600.7507532473. The cubic root of 31368409 is about 315.3775903696.

The spelling of 31368409 in words is "thirty-one million, three hundred sixty-eight thousand, four hundred nine".