725491781 has 8 divisors (see below), whose sum is σ = 831801984. Its totient is φ = 619848720.

The previous prime is 725491771. The next prime is 725491799. The reversal of 725491781 is 187194527.

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 725491781 - 2⁶ = 725491717 is a prime.

It is a super-2 number, since 2×725491781² = 1052676648597103922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725491721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164450 + ... + 168803.

It is an arithmetic number, because the mean of its divisors is an integer number (103975248).

Almost surely, 2^725491781 is an apocalyptic number.

It is an amenable number.

725491781 is a deficient number, since it is larger than the sum of its proper divisors (106310203).

725491781 is a wasteful number, since it uses less digits than its factorization.

725491781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333571.

The product of its digits is 141120, while the sum is 44.

The square root of 725491781 is about 26934.9546314821. The cubic root of 725491781 is about 898.5539663736.

The spelling of 725491781 in words is "seven hundred twenty-five million, four hundred ninety-one thousand, seven hundred eighty-one".