725578369 has 2 divisors, whose sum is σ = 725578370. Its totient is φ = 725578368.

The previous prime is 725578361. The next prime is 725578391. The reversal of 725578369 is 963875527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 368179344 + 357399025 = 19188^2 + 18905^2 .

It is an emirp because it is prime and its reverse (963875527) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 725578369 - 2³ = 725578361 is a prime.

It is a super-2 number, since 2×725578369² = 1052927939121400322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (725578361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362789184 + 362789185.

It is an arithmetic number, because the mean of its divisors is an integer number (362789185).

Almost surely, 2^725578369 is an apocalyptic number.

It is an amenable number.

725578369 is a deficient number, since it is larger than the sum of its proper divisors (1).

725578369 is an equidigital number, since it uses as much as digits as its factorization.

725578369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3175200, while the sum is 52.

The square root of 725578369 is about 26936.5619372629. The cubic root of 725578369 is about 898.5897126530.

The spelling of 725578369 in words is "seven hundred twenty-five million, five hundred seventy-eight thousand, three hundred sixty-nine".