725671109 has 4 divisors (see below), whose sum is σ = 727186560. Its totient is φ = 724155660.

The previous prime is 725671081. The next prime is 725671181. The reversal of 725671109 is 901176527.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 901176527 = 743 ⋅1212889.

It is a cyclic number.

It is not a de Polignac number, because 725671109 - 2²⁰ = 724622533 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 (725674109) 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, 757007 + ... + 757964.

It is an arithmetic number, because the mean of its divisors is an integer number (181796640).

Almost surely, 2^725671109 is an apocalyptic number.

It is an amenable number.

725671109 is a deficient number, since it is larger than the sum of its proper divisors (1515451).

725671109 is a wasteful number, since it uses less digits than its factorization.

725671109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515450.

The product of its (nonzero) digits is 26460, while the sum is 38.

The square root of 725671109 is about 26938.2833343181. The cubic root of 725671109 is about 898.6279955196.

The spelling of 725671109 in words is "seven hundred twenty-five million, six hundred seventy-one thousand, one hundred nine".