1291124208 has 240 divisors, whose sum is σ = 3875751936. Its totient is φ = 369600000.

The previous prime is 1291124129. The next prime is 1291124243. The reversal of 1291124208 is 8024211921.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12783358 + ... + 12783458.

Almost surely, 2^1291124208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1291124208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1937875968).

1291124208 is an abundant number, since it is smaller than the sum of its proper divisors (2584627728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1291124208 is a wasteful number, since it uses less digits than its factorization.

1291124208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1291124208 is about 35932.2168534033. The cubic root of 1291124208 is about 1088.9033686322.

The spelling of 1291124208 in words is "one billion, two hundred ninety-one million, one hundred twenty-four thousand, two hundred eight".