725556109 has 2 divisors, whose sum is σ = 725556110. Its totient is φ = 725556108.

The previous prime is 725556103. The next prime is 725556113. The reversal of 725556109 is 901655527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 489073225 + 236482884 = 22115^2 + 15378^2 .

It is a cyclic number.

It is not a de Polignac number, because 725556109 - 2⁵ = 725556077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (725556103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362778054 + 362778055.

It is an arithmetic number, because the mean of its divisors is an integer number (362778055).

Almost surely, 2^725556109 is an apocalyptic number.

It is an amenable number.

725556109 is a deficient number, since it is larger than the sum of its proper divisors (1).

725556109 is an equidigital number, since it uses as much as digits as its factorization.

725556109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94500, while the sum is 40.

The square root of 725556109 is about 26936.1487410506. The cubic root of 725556109 is about 898.5805232889.

The spelling of 725556109 in words is "seven hundred twenty-five million, five hundred fifty-six thousand, one hundred nine".