31498009 has 2 divisors, whose sum is σ = 31498010. Its totient is φ = 31498008.

The previous prime is 31498007. The next prime is 31498039. The reversal of 31498009 is 90089413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15776784 + 15721225 = 3972^2 + 3965^2 .

It is a cyclic number.

It is not a de Polignac number, because 31498009 - 2¹ = 31498007 is a prime.

Together with 31498007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31498003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15749004 + 15749005.

It is an arithmetic number, because the mean of its divisors is an integer number (15749005).

Almost surely, 2^31498009 is an apocalyptic number.

It is an amenable number.

31498009 is a deficient number, since it is larger than the sum of its proper divisors (1).

31498009 is an equidigital number, since it uses as much as digits as its factorization.

31498009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 31498009 is about 5612.3087049805. The cubic root of 31498009 is about 315.8113258421.

The spelling of 31498009 in words is "thirty-one million, four hundred ninety-eight thousand, nine".