31097009 has 2 divisors, whose sum is σ = 31097010. Its totient is φ = 31097008.

The previous prime is 31096997. The next prime is 31097023. The reversal of 31097009 is 90079013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31080625 + 16384 = 5575^2 + 128^2 .

It is an emirp because it is prime and its reverse (90079013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31097009 - 2²⁰ = 30048433 is a prime.

It is not a weakly prime, because it can be changed into another prime (31097069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15548504 + 15548505.

It is an arithmetic number, because the mean of its divisors is an integer number (15548505).

Almost surely, 2^31097009 is an apocalyptic number.

It is an amenable number.

31097009 is a deficient number, since it is larger than the sum of its proper divisors (1).

31097009 is an equidigital number, since it uses as much as digits as its factorization.

31097009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1701, while the sum is 29.

The square root of 31097009 is about 5576.4692234424. The cubic root of 31097009 is about 314.4654038072.

The spelling of 31097009 in words is "thirty-one million, ninety-seven thousand, nine".