1296978011 has 8 divisors (see below), whose sum is σ = 1512511200. Its totient is φ = 1111695144.

The previous prime is 1296977947. The next prime is 1296978013. The reversal of 1296978011 is 1108796921.

It is not a de Polignac number, because 1296978011 - 2⁶ = 1296977947 is a prime.

It is a super-2 number, since 2×1296978011² = 3364303922035032242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1296978013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1890296 + ... + 1890981.

It is an arithmetic number, because the mean of its divisors is an integer number (189063900).

Almost surely, 2^1296978011 is an apocalyptic number.

1296978011 is a deficient number, since it is larger than the sum of its proper divisors (215533189).

1296978011 is an frugal number, since it uses more digits than its factorization.

1296978011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3781298 (or 3781284 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 44.

The square root of 1296978011 is about 36013.5809244235. The cubic root of 1296978011 is about 1090.5465404334.

The spelling of 1296978011 in words is "one billion, two hundred ninety-six million, nine hundred seventy-eight thousand, eleven".