725117161 has 2 divisors, whose sum is σ = 725117162. Its totient is φ = 725117160.

The previous prime is 725117153. The next prime is 725117177. The reversal of 725117161 is 161711527.

It is a happy number.

725117161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 695957161 + 29160000 = 26381^2 + 5400^2 .

It is a cyclic number.

It is not a de Polignac number, because 725117161 - 2³ = 725117153 is a prime.

It is a super-3 number, since 3×725117161³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (725117101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362558580 + 362558581.

It is an arithmetic number, because the mean of its divisors is an integer number (362558581).

Almost surely, 2^725117161 is an apocalyptic number.

It is an amenable number.

725117161 is a deficient number, since it is larger than the sum of its proper divisors (1).

725117161 is an equidigital number, since it uses as much as digits as its factorization.

725117161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2940, while the sum is 31.

The square root of 725117161 is about 26927.9995729352. Note that the first 3 decimals coincide. The cubic root of 725117161 is about 898.3992785460.

Adding to 725117161 its reverse (161711527), we get a palindrome (886828688).

The spelling of 725117161 in words is "seven hundred twenty-five million, one hundred seventeen thousand, one hundred sixty-one".