397517609 has 2 divisors, whose sum is σ = 397517610. Its totient is φ = 397517608.

The previous prime is 397517581. The next prime is 397517629. The reversal of 397517609 is 906715793.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386987584 + 10530025 = 19672^2 + 3245^2 .

It is an emirp because it is prime and its reverse (906715793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397517609 - 2⁸ = 397517353 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (397517629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198758804 + 198758805.

It is an arithmetic number, because the mean of its divisors is an integer number (198758805).

Almost surely, 2^397517609 is an apocalyptic number.

It is an amenable number.

397517609 is a deficient number, since it is larger than the sum of its proper divisors (1).

397517609 is an equidigital number, since it uses as much as digits as its factorization.

397517609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 357210, while the sum is 47.

The square root of 397517609 is about 19937.8436396718. The cubic root of 397517609 is about 735.2789346533.

The spelling of 397517609 in words is "three hundred ninety-seven million, five hundred seventeen thousand, six hundred nine".