31030609 has 4 divisors (see below), whose sum is σ = 32100660. Its totient is φ = 29960560.

The previous prime is 31030607. The next prime is 31030613. The reversal of 31030609 is 90603013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90603013 = 17 ⋅5329589.

It can be written as a sum of positive squares in 2 ways, for example, as 12780625 + 18249984 = 3575^2 + 4272^2 .

It is a cyclic number.

It is not a de Polignac number, because 31030609 - 2¹ = 31030607 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31030609.

It is not an unprimeable number, because it can be changed into a prime (31030607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534982 + ... + 535039.

It is an arithmetic number, because the mean of its divisors is an integer number (8025165).

Almost surely, 2^31030609 is an apocalyptic number.

It is an amenable number.

31030609 is a deficient number, since it is larger than the sum of its proper divisors (1070051).

31030609 is a wasteful number, since it uses less digits than its factorization.

31030609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070050.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 31030609 is about 5570.5124539848. The cubic root of 31030609 is about 314.2414231859.

The spelling of 31030609 in words is "thirty-one million, thirty thousand, six hundred nine".