1291289206 has 16 divisors (see below), whose sum is σ = 2004639840. Its totient is φ = 623096320.

The previous prime is 1291289171. The next prime is 1291289227. The reversal of 1291289206 is 6029821921.

It is a super-2 number, since 2×1291289206² = 3334855627064220872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181590 + ... + 188566.

It is an arithmetic number, because the mean of its divisors is an integer number (125289990).

Almost surely, 2^1291289206 is an apocalyptic number.

1291289206 is a deficient number, since it is larger than the sum of its proper divisors (713350634).

1291289206 is a wasteful number, since it uses less digits than its factorization.

1291289206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10199.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1291289206 is about 35934.5127419310. The cubic root of 1291289206 is about 1088.9497517826.

The spelling of 1291289206 in words is "one billion, two hundred ninety-one million, two hundred eighty-nine thousand, two hundred six".