725629391 has 4 divisors (see below), whose sum is σ = 728211984. Its totient is φ = 723046800.

The previous prime is 725629367. The next prime is 725629423. The reversal of 725629391 is 193926527.

725629391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193926527 = 5081 ⋅38167.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-725629391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725629321) 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, 1290875 + ... + 1291436.

It is an arithmetic number, because the mean of its divisors is an integer number (182052996).

Almost surely, 2^725629391 is an apocalyptic number.

725629391 is a deficient number, since it is larger than the sum of its proper divisors (2582593).

725629391 is a wasteful number, since it uses less digits than its factorization.

725629391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2582592.

The product of its digits is 204120, while the sum is 44.

The square root of 725629391 is about 26937.5089976783. The cubic root of 725629391 is about 898.6107748252.

The spelling of 725629391 in words is "seven hundred twenty-five million, six hundred twenty-nine thousand, three hundred ninety-one".