1291774848 has 192 divisors, whose sum is σ = 4299336720. Its totient is φ = 340623360.

The previous prime is 1291774789. The next prime is 1291774849. The reversal of 1291774848 is 8484771921.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1291774848.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291774849) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 241968 + ... + 247248.

Almost surely, 2^1291774848 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 1291774848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2149668360).

1291774848 is an abundant number, since it is smaller than the sum of its proper divisors (3007561872).

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

1291774848 is a wasteful number, since it uses less digits than its factorization.

1291774848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5325 (or 5306 counting only the distinct ones).

The product of its digits is 903168, while the sum is 51.

The square root of 1291774848 is about 35941.2694266633. The cubic root of 1291774848 is about 1089.0862493360.

The spelling of 1291774848 in words is "one billion, two hundred ninety-one million, seven hundred seventy-four thousand, eight hundred forty-eight".