725451997 has 8 divisors (see below), whose sum is σ = 729479520. Its totient is φ = 721434000.

The previous prime is 725451989. The next prime is 725452001. The reversal of 725451997 is 799154527.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 725451997 - 2³ = 725451989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 725451997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725451917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192154 + ... + 195892.

It is an arithmetic number, because the mean of its divisors is an integer number (91184940).

Almost surely, 2^725451997 is an apocalyptic number.

It is an amenable number.

725451997 is a deficient number, since it is larger than the sum of its proper divisors (4027523).

725451997 is a wasteful number, since it uses less digits than its factorization.

725451997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4763.

The product of its digits is 793800, while the sum is 49.

The square root of 725451997 is about 26934.2161014573. The cubic root of 725451997 is about 898.5375413199.

The spelling of 725451997 in words is "seven hundred twenty-five million, four hundred fifty-one thousand, nine hundred ninety-seven".