31361917 has 2 divisors, whose sum is σ = 31361918. Its totient is φ = 31361916.

The previous prime is 31361893. The next prime is 31361933. The reversal of 31361917 is 71916313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29474041 + 1887876 = 5429^2 + 1374^2 .

It is a cyclic number.

It is not a de Polignac number, because 31361917 - 2¹⁵ = 31329149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31361947) 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, 15680958 + 15680959.

It is an arithmetic number, because the mean of its divisors is an integer number (15680959).

Almost surely, 2^31361917 is an apocalyptic number.

It is an amenable number.

31361917 is a deficient number, since it is larger than the sum of its proper divisors (1).

31361917 is an equidigital number, since it uses as much as digits as its factorization.

31361917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 31.

The square root of 31361917 is about 5600.1711580987. The cubic root of 31361917 is about 315.3558320397.

The spelling of 31361917 in words is "thirty-one million, three hundred sixty-one thousand, nine hundred seventeen".