1296509913 has 54 divisors (see below), whose sum is σ = 2061469566. Its totient is φ = 782476800.

The previous prime is 1296509911. The next prime is 1296509917. The reversal of 1296509913 is 3199056921.

It is a happy number.

1296509913 is a `hidden beast` number, since 129 + 6 + 509 + 9 + 13 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 725904 + 1295784009 = 852^2 + 35997^2 .

It is not a de Polignac number, because 1296509913 - 2¹ = 1296509911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1296509911) 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 in 53 ways as a sum of consecutive naturals, for example, 18260668 + ... + 18260738.

Almost surely, 2^1296509913 is an apocalyptic number.

It is an amenable number.

1296509913 is a deficient number, since it is larger than the sum of its proper divisors (764959653).

1296509913 is an equidigital number, since it uses as much as digits as its factorization.

1296509913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 1296509913 is about 36007.0814285190. The cubic root of 1296509913 is about 1090.4153266744.

The spelling of 1296509913 in words is "one billion, two hundred ninety-six million, five hundred nine thousand, nine hundred thirteen".