725200109 has 2 divisors, whose sum is σ = 725200110. Its totient is φ = 725200108.

The previous prime is 725200061. The next prime is 725200121. The reversal of 725200109 is 901002527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 389944009 + 335256100 = 19747^2 + 18310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-725200109 is a prime.

It is a super-2 number, since 2×725200109² = 1051830396187223762, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (725200139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362600054 + 362600055.

It is an arithmetic number, because the mean of its divisors is an integer number (362600055).

Almost surely, 2^725200109 is an apocalyptic number.

It is an amenable number.

725200109 is a deficient number, since it is larger than the sum of its proper divisors (1).

725200109 is an equidigital number, since it uses as much as digits as its factorization.

725200109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 725200109 is about 26929.5397101399. The cubic root of 725200109 is about 898.4335339675.

The spelling of 725200109 in words is "seven hundred twenty-five million, two hundred thousand, one hundred nine".