725556001 has 4 divisors (see below), whose sum is σ = 725869332. Its totient is φ = 725242672.

The previous prime is 725555969. The next prime is 725556019. The reversal of 725556001 is 100655527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100655527 = 7 ⋅14379361.

It can be written as a sum of positive squares in 2 ways, for example, as 475283601 + 250272400 = 21801^2 + 15820^2 .

It is a cyclic number.

It is not a de Polignac number, because 725556001 - 2⁵ = 725555969 is a prime.

It is a super-2 number, since 2×725556001² = 1052863021174224002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725556301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153166 + ... + 157831.

It is an arithmetic number, because the mean of its divisors is an integer number (181467333).

Almost surely, 2^725556001 is an apocalyptic number.

It is an amenable number.

725556001 is a deficient number, since it is larger than the sum of its proper divisors (313331).

725556001 is a wasteful number, since it uses less digits than its factorization.

725556001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313330.

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 725556001 is about 26936.1467363096. The cubic root of 725556001 is about 898.5804787039.

The spelling of 725556001 in words is "seven hundred twenty-five million, five hundred fifty-six thousand, one".