1291212122 has 8 divisors (see below), whose sum is σ = 1950955956. Its totient is φ = 640893472.

The previous prime is 1291212119. The next prime is 1291212163. The reversal of 1291212122 is 2212121921.

It can be written as a sum of positive squares in 2 ways, for example, as 1229133481 + 62078641 = 35059^2 + 7879^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 2355953 + ... + 2356500.

Almost surely, 2^1291212122 is an apocalyptic number.

1291212122 is a deficient number, since it is larger than the sum of its proper divisors (659743834).

1291212122 is a wasteful number, since it uses less digits than its factorization.

1291212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4712592.

The product of its digits is 288, while the sum is 23.

The square root of 1291212122 is about 35933.4401637249. The cubic root of 1291212122 is about 1088.9280829283.

The spelling of 1291212122 in words is "one billion, two hundred ninety-one million, two hundred twelve thousand, one hundred twenty-two".