31420817 has 2 divisors, whose sum is σ = 31420818. Its totient is φ = 31420816.

The previous prime is 31420793. The next prime is 31420841. The reversal of 31420817 is 71802413.

It is a balanced prime because it is at equal distance from previous prime (31420793) and next prime (31420841).

It can be written as a sum of positive squares in only one way, i.e., 26204161 + 5216656 = 5119^2 + 2284^2 .

It is an emirp because it is prime and its reverse (71802413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31420817 - 2⁸ = 31420561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31420847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15710408 + 15710409.

It is an arithmetic number, because the mean of its divisors is an integer number (15710409).

Almost surely, 2^31420817 is an apocalyptic number.

It is an amenable number.

31420817 is a deficient number, since it is larger than the sum of its proper divisors (1).

31420817 is an equidigital number, since it uses as much as digits as its factorization.

31420817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 31420817 is about 5605.4274591685. The cubic root of 31420817 is about 315.5531291049.

The spelling of 31420817 in words is "thirty-one million, four hundred twenty thousand, eight hundred seventeen".