725609617 has 2 divisors, whose sum is σ = 725609618. Its totient is φ = 725609616.

The previous prime is 725609611. The next prime is 725609669. The reversal of 725609617 is 716906527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 606341376 + 119268241 = 24624^2 + 10921^2 .

It is a cyclic number.

It is not a de Polignac number, because 725609617 - 2¹⁵ = 725576849 is a prime.

It is not a weakly prime, because it can be changed into another prime (725609611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362804808 + 362804809.

It is an arithmetic number, because the mean of its divisors is an integer number (362804809).

Almost surely, 2^725609617 is an apocalyptic number.

It is an amenable number.

725609617 is a deficient number, since it is larger than the sum of its proper divisors (1).

725609617 is an equidigital number, since it uses as much as digits as its factorization.

725609617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 725609617 is about 26937.1419604976. The cubic root of 725609617 is about 898.6026121226.

The spelling of 725609617 in words is "seven hundred twenty-five million, six hundred nine thousand, six hundred seventeen".