731129849 has 2 divisors, whose sum is σ = 731129850. Its totient is φ = 731129848.

The previous prime is 731129803. The next prime is 731129851. The reversal of 731129849 is 948921137.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 560174224 + 170955625 = 23668^2 + 13075^2 .

It is an emirp because it is prime and its reverse (948921137) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 731129849 - 2¹² = 731125753 is a prime.

It is a Sophie Germain prime.

Together with 731129851, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (731129869) 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, 365564924 + 365564925.

It is an arithmetic number, because the mean of its divisors is an integer number (365564925).

Almost surely, 2^731129849 is an apocalyptic number.

It is an amenable number.

731129849 is a deficient number, since it is larger than the sum of its proper divisors (1).

731129849 is an equidigital number, since it uses as much as digits as its factorization.

731129849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 731129849 is about 27039.4128819396. The cubic root of 731129849 is about 900.8756288760.

The spelling of 731129849 in words is "seven hundred thirty-one million, one hundred twenty-nine thousand, eight hundred forty-nine".