731249129 has 8 divisors (see below), whose sum is σ = 788619720. Its totient is φ = 674038656.

The previous prime is 731249119. The next prime is 731249137. The reversal of 731249129 is 921942137.

It can be written as a sum of positive squares in 4 ways, for example, as 40347904 + 690901225 = 6352^2 + 26285^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 731249129 - 2¹² = 731245033 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 731249092 and 731249101.

It is not an unprimeable number, because it can be changed into a prime (731249119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30452 + ... + 48885.

It is an arithmetic number, because the mean of its divisors is an integer number (98577465).

Almost surely, 2^731249129 is an apocalyptic number.

It is an amenable number.

731249129 is a deficient number, since it is larger than the sum of its proper divisors (57370591).

731249129 is a wasteful number, since it uses less digits than its factorization.

731249129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80059.

The product of its digits is 27216, while the sum is 38.

The square root of 731249129 is about 27041.6184611794. The cubic root of 731249129 is about 900.9246172566.

The spelling of 731249129 in words is "seven hundred thirty-one million, two hundred forty-nine thousand, one hundred twenty-nine".