1291079855 has 16 divisors (see below), whose sum is σ = 1726008480. Its totient is φ = 920535168.

The previous prime is 1291079851. The next prime is 1291079863. The reversal of 1291079855 is 5589701921.

It is a happy number.

It is not a de Polignac number, because 1291079855 - 2² = 1291079851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291079851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 340577 + ... + 344346.

It is an arithmetic number, because the mean of its divisors is an integer number (107875530).

Almost surely, 2^1291079855 is an apocalyptic number.

1291079855 is a deficient number, since it is larger than the sum of its proper divisors (434928625).

1291079855 is a wasteful number, since it uses less digits than its factorization.

1291079855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684970.

The product of its (nonzero) digits is 226800, while the sum is 47.

The square root of 1291079855 is about 35931.5996721549. The cubic root of 1291079855 is about 1088.8908997352.

The spelling of 1291079855 in words is "one billion, two hundred ninety-one million, seventy-nine thousand, eight hundred fifty-five".