731625281 has 2 divisors, whose sum is σ = 731625282. Its totient is φ = 731625280.

The previous prime is 731625269. The next prime is 731625289. The reversal of 731625281 is 182526137.

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., 731215681 + 409600 = 27041^2 + 640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-731625281 is a prime.

It is a super-2 number, since 2×731625281² = 1070551103596657922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (731625289) 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, 365812640 + 365812641.

It is an arithmetic number, because the mean of its divisors is an integer number (365812641).

Almost surely, 2^731625281 is an apocalyptic number.

It is an amenable number.

731625281 is a deficient number, since it is larger than the sum of its proper divisors (1).

731625281 is an equidigital number, since it uses as much as digits as its factorization.

731625281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 731625281 is about 27048.5726240776. The cubic root of 731625281 is about 901.0790682696.

The spelling of 731625281 in words is "seven hundred thirty-one million, six hundred twenty-five thousand, two hundred eighty-one".