245690609 has 2 divisors, whose sum is σ = 245690610. Its totient is φ = 245690608.

The previous prime is 245690591. The next prime is 245690617. The reversal of 245690609 is 906096542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123654400 + 122036209 = 11120^2 + 11047^2 .

It is a cyclic number.

It is not a de Polignac number, because 245690609 - 2⁸ = 245690353 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (245690629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122845304 + 122845305.

It is an arithmetic number, because the mean of its divisors is an integer number (122845305).

Almost surely, 2^245690609 is an apocalyptic number.

It is an amenable number.

245690609 is a deficient number, since it is larger than the sum of its proper divisors (1).

245690609 is an equidigital number, since it uses as much as digits as its factorization.

245690609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 245690609 is about 15674.5210134154. The cubic root of 245690609 is about 626.3198637866.

The spelling of 245690609 in words is "two hundred forty-five million, six hundred ninety thousand, six hundred nine".