1291870867 has 16 divisors (see below), whose sum is σ = 1495134720. Its totient is φ = 1093321152.

The previous prime is 1291870829. The next prime is 1291870897. The reversal of 1291870867 is 7680781921.

It is not a de Polignac number, because 1291870867 - 2¹⁹ = 1291346579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1291870867.

It is not an unprimeable number, because it can be changed into a prime (1291870897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 723658 + ... + 725440.

It is an arithmetic number, because the mean of its divisors is an integer number (93445920).

Almost surely, 2^1291870867 is an apocalyptic number.

1291870867 is a deficient number, since it is larger than the sum of its proper divisors (203263853).

1291870867 is a wasteful number, since it uses less digits than its factorization.

1291870867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3042.

The product of its (nonzero) digits is 338688, while the sum is 49.

The square root of 1291870867 is about 35942.6051782561. The cubic root of 1291870867 is about 1089.1132329810.

The spelling of 1291870867 in words is "one billion, two hundred ninety-one million, eight hundred seventy thousand, eight hundred sixty-seven".