361205609 has 2 divisors, whose sum is σ = 361205610. Its totient is φ = 361205608.

The previous prime is 361205597. The next prime is 361205657. The reversal of 361205609 is 906502163.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 261145600 + 100060009 = 16160^2 + 10003^2 .

It is a cyclic number.

It is not a de Polignac number, because 361205609 - 2²⁴ = 344428393 is a prime.

It is not a weakly prime, because it can be changed into another prime (361205659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180602804 + 180602805.

It is an arithmetic number, because the mean of its divisors is an integer number (180602805).

Almost surely, 2^361205609 is an apocalyptic number.

It is an amenable number.

361205609 is a deficient number, since it is larger than the sum of its proper divisors (1).

361205609 is an equidigital number, since it uses as much as digits as its factorization.

361205609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 361205609 is about 19005.4099929467. The cubic root of 361205609 is about 712.1718913616.

The spelling of 361205609 in words is "three hundred sixty-one million, two hundred five thousand, six hundred nine".