725559157 has 2 divisors, whose sum is σ = 725559158. Its totient is φ = 725559156.

The previous prime is 725559143. The next prime is 725559169. The reversal of 725559157 is 751955527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 723018321 + 2540836 = 26889^2 + 1594^2 .

It is an emirp because it is prime and its reverse (751955527) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-725559157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (725554157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362779578 + 362779579.

It is an arithmetic number, because the mean of its divisors is an integer number (362779579).

Almost surely, 2^725559157 is an apocalyptic number.

It is an amenable number.

725559157 is a deficient number, since it is larger than the sum of its proper divisors (1).

725559157 is an equidigital number, since it uses as much as digits as its factorization.

725559157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 551250, while the sum is 46.

The square root of 725559157 is about 26936.2053192353. The cubic root of 725559157 is about 898.5817815741.

The spelling of 725559157 in words is "seven hundred twenty-five million, five hundred fifty-nine thousand, one hundred fifty-seven".