31143317 has 2 divisors, whose sum is σ = 31143318. Its totient is φ = 31143316.

The previous prime is 31143271. The next prime is 31143323. The reversal of 31143317 is 71334113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26977636 + 4165681 = 5194^2 + 2041^2 .

It is a cyclic number.

It is not a de Polignac number, because 31143317 - 2⁸ = 31143061 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31143292 and 31143301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31143377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571658 + 15571659.

It is an arithmetic number, because the mean of its divisors is an integer number (15571659).

It is a self-describing number.

Almost surely, 2^31143317 is an apocalyptic number.

It is an amenable number.

31143317 is a deficient number, since it is larger than the sum of its proper divisors (1).

31143317 is an equidigital number, since it uses as much as digits as its factorization.

31143317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 23.

The square root of 31143317 is about 5580.6197684487. The cubic root of 31143317 is about 314.6214213998.

The spelling of 31143317 in words is "thirty-one million, one hundred forty-three thousand, three hundred seventeen".