31609469 has 2 divisors, whose sum is σ = 31609470. Its totient is φ = 31609468.

The previous prime is 31609463. The next prime is 31609481. The reversal of 31609469 is 96490613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28494244 + 3115225 = 5338^2 + 1765^2 .

It is an emirp because it is prime and its reverse (96490613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31609469 - 2⁴ = 31609453 is a prime.

It is a super-2 number, since 2×31609469² = 1998317060923922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31609463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15804734 + 15804735.

It is an arithmetic number, because the mean of its divisors is an integer number (15804735).

Almost surely, 2^31609469 is an apocalyptic number.

It is an amenable number.

31609469 is a deficient number, since it is larger than the sum of its proper divisors (1).

31609469 is an equidigital number, since it uses as much as digits as its factorization.

31609469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 31609469 is about 5622.2298956909. The cubic root of 31609469 is about 316.1834011207.

The spelling of 31609469 in words is "thirty-one million, six hundred nine thousand, four hundred sixty-nine".