31431017 has 2 divisors, whose sum is σ = 31431018. Its totient is φ = 31431016.

The previous prime is 31431013. The next prime is 31431031. The reversal of 31431017 is 71013413.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30591961 + 839056 = 5531^2 + 916^2 .

It is a cyclic number.

It is not a de Polignac number, because 31431017 - 2² = 31431013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31431017.

It is not a weakly prime, because it can be changed into another prime (31431013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15715508 + 15715509.

It is an arithmetic number, because the mean of its divisors is an integer number (15715509).

Almost surely, 2^31431017 is an apocalyptic number.

It is an amenable number.

31431017 is a deficient number, since it is larger than the sum of its proper divisors (1).

31431017 is an equidigital number, since it uses as much as digits as its factorization.

31431017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 31431017 is about 5606.3372178277. The cubic root of 31431017 is about 315.5872709468.

The spelling of 31431017 in words is "thirty-one million, four hundred thirty-one thousand, seventeen".