725217281 has 2 divisors, whose sum is σ = 725217282. Its totient is φ = 725217280.

The previous prime is 725217277. The next prime is 725217293. The reversal of 725217281 is 182712527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 418407025 + 306810256 = 20455^2 + 17516^2 .

It is a cyclic number.

It is not a de Polignac number, because 725217281 - 2² = 725217277 is a prime.

It is a super-2 number, since 2×725217281² = 1051880209322065922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (725217271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362608640 + 362608641.

It is an arithmetic number, because the mean of its divisors is an integer number (362608641).

Almost surely, 2^725217281 is an apocalyptic number.

It is an amenable number.

725217281 is a deficient number, since it is larger than the sum of its proper divisors (1).

725217281 is an equidigital number, since it uses as much as digits as its factorization.

725217281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15680, while the sum is 35.

The square root of 725217281 is about 26929.8585402894. The cubic root of 725217281 is about 898.4406252419.

The spelling of 725217281 in words is "seven hundred twenty-five million, two hundred seventeen thousand, two hundred eighty-one".