725122681 has 2 divisors, whose sum is σ = 725122682. Its totient is φ = 725122680.

The previous prime is 725122667. The next prime is 725122691. The reversal of 725122681 is 186221527.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 422919225 + 302203456 = 20565^2 + 17384^2 .

It is a cyclic number.

It is not a de Polignac number, because 725122681 - 2⁹ = 725122169 is a prime.

It is a super-2 number, since 2×725122681² = 1051605805001255522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (725122661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362561340 + 362561341.

It is an arithmetic number, because the mean of its divisors is an integer number (362561341).

Almost surely, 2^725122681 is an apocalyptic number.

It is an amenable number.

725122681 is a deficient number, since it is larger than the sum of its proper divisors (1).

725122681 is an equidigital number, since it uses as much as digits as its factorization.

725122681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 34.

The square root of 725122681 is about 26928.1020682855. The cubic root of 725122681 is about 898.4015582472.

The spelling of 725122681 in words is "seven hundred twenty-five million, one hundred twenty-two thousand, six hundred eighty-one".