1331039249 has 4 divisors (see below), whose sum is σ = 1339517364. Its totient is φ = 1322561136.

The previous prime is 1331039239. The next prime is 1331039261. The reversal of 1331039249 is 9429301331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 470673025 + 860366224 = 21695^2 + 29332^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331039249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331039239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4238822 + ... + 4239135.

It is an arithmetic number, because the mean of its divisors is an integer number (334879341).

Almost surely, 2^1331039249 is an apocalyptic number.

It is an amenable number.

1331039249 is a deficient number, since it is larger than the sum of its proper divisors (8478115).

1331039249 is an equidigital number, since it uses as much as digits as its factorization.

1331039249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8478114.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 1331039249 is about 36483.4105998877. The cubic root of 1331039249 is about 1100.0108122904.

The spelling of 1331039249 in words is "one billion, three hundred thirty-one million, thirty-nine thousand, two hundred forty-nine".