31328117 has 2 divisors, whose sum is σ = 31328118. Its totient is φ = 31328116.

The previous prime is 31328113. The next prime is 31328137. The reversal of 31328117 is 71182313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28366276 + 2961841 = 5326^2 + 1721^2 .

It is an emirp because it is prime and its reverse (71182313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31328117 - 2² = 31328113 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31328113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15664058 + 15664059.

It is an arithmetic number, because the mean of its divisors is an integer number (15664059).

Almost surely, 2^31328117 is an apocalyptic number.

It is an amenable number.

31328117 is a deficient number, since it is larger than the sum of its proper divisors (1).

31328117 is an equidigital number, since it uses as much as digits as its factorization.

31328117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 31328117 is about 5597.1525796605. The cubic root of 31328117 is about 315.2425007592.

The spelling of 31328117 in words is "thirty-one million, three hundred twenty-eight thousand, one hundred seventeen".