725345561 has 2 divisors, whose sum is σ = 725345562. Its totient is φ = 725345560.

The previous prime is 725345557. The next prime is 725345567. The reversal of 725345561 is 165543527.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 496398400 + 228947161 = 22280^2 + 15131^2 .

It is a cyclic number.

It is not a de Polignac number, because 725345561 - 2² = 725345557 is a prime.

It is a super-2 number, since 2×725345561² = 1052252365724809442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (725345567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362672780 + 362672781.

It is an arithmetic number, because the mean of its divisors is an integer number (362672781).

Almost surely, 2^725345561 is an apocalyptic number.

It is an amenable number.

725345561 is a deficient number, since it is larger than the sum of its proper divisors (1).

725345561 is an equidigital number, since it uses as much as digits as its factorization.

725345561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126000, while the sum is 38.

The square root of 725345561 is about 26932.2401778983. The cubic root of 725345561 is about 898.4935956512.

The spelling of 725345561 in words is "seven hundred twenty-five million, three hundred forty-five thousand, five hundred sixty-one".