725556019 has 2 divisors, whose sum is σ = 725556020. Its totient is φ = 725556018.

The previous prime is 725555969. The next prime is 725556047. The reversal of 725556019 is 910655527.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 725556019 - 2⁷ = 725555891 is a prime.

It is a super-2 number, since 2×725556019² = 1052863073414256722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (725556079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362778009 + 362778010.

It is an arithmetic number, because the mean of its divisors is an integer number (362778010).

Almost surely, 2^725556019 is an apocalyptic number.

725556019 is a deficient number, since it is larger than the sum of its proper divisors (1).

725556019 is an equidigital number, since it uses as much as digits as its factorization.

725556019 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 725556019 is about 26936.1470704331. The cubic root of 725556019 is about 898.5804861347.

The spelling of 725556019 in words is "seven hundred twenty-five million, five hundred fifty-six thousand, nineteen".