31790609 has 2 divisors, whose sum is σ = 31790610. Its totient is φ = 31790608.

The previous prime is 31790597. The next prime is 31790611. The reversal of 31790609 is 90609713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18490000 + 13300609 = 4300^2 + 3647^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31790609 is a prime.

Together with 31790611, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1961666 and since 31790609 and 1961666 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (31790639) 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, 15895304 + 15895305.

It is an arithmetic number, because the mean of its divisors is an integer number (15895305).

Almost surely, 2^31790609 is an apocalyptic number.

It is an amenable number.

31790609 is a deficient number, since it is larger than the sum of its proper divisors (1).

31790609 is an equidigital number, since it uses as much as digits as its factorization.

31790609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 31790609 is about 5638.3161493481. The cubic root of 31790609 is about 316.7862205399.

The spelling of 31790609 in words is "thirty-one million, seven hundred ninety thousand, six hundred nine".