1291086105 has 16 divisors (see below), whose sum is σ = 2116122624. Its totient is φ = 671784320.

The previous prime is 1291086101. The next prime is 1291086179. The reversal of 1291086105 is 5016801921.

It is not a de Polignac number, because 1291086105 - 2² = 1291086101 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1291086101) 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, 1049049 + ... + 1050278.

It is an arithmetic number, because the mean of its divisors is an integer number (132257664).

Almost surely, 2^1291086105 is an apocalyptic number.

1291086105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1291086105 is a deficient number, since it is larger than the sum of its proper divisors (825036519).

1291086105 is a wasteful number, since it uses less digits than its factorization.

1291086105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099376.

The product of its (nonzero) digits is 4320, while the sum is 33.

The square root of 1291086105 is about 35931.6866428505. The cubic root of 1291086105 is about 1088.8926568063.

The spelling of 1291086105 in words is "one billion, two hundred ninety-one million, eighty-six thousand, one hundred five".