1291079851 has 2 divisors, whose sum is σ = 1291079852. Its totient is φ = 1291079850.

The previous prime is 1291079843. The next prime is 1291079863. The reversal of 1291079851 is 1589701921.

It is a weak prime.

It is an emirp because it is prime and its reverse (1589701921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1291079851 - 2³ = 1291079843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1291079798 and 1291079807.

It is not a weakly prime, because it can be changed into another prime (1291079891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645539925 + 645539926.

It is an arithmetic number, because the mean of its divisors is an integer number (645539926).

Almost surely, 2^1291079851 is an apocalyptic number.

1291079851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291079851 is an equidigital number, since it uses as much as digits as its factorization.

1291079851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 43.

The square root of 1291079851 is about 35931.5996164936. The cubic root of 1291079851 is about 1088.8908986107.

The spelling of 1291079851 in words is "one billion, two hundred ninety-one million, seventy-nine thousand, eight hundred fifty-one".