1291021368 has 64 divisors (see below), whose sum is σ = 3972380160. Its totient is φ = 340488576.

The previous prime is 1291021351. The next prime is 1291021409. The reversal of 1291021368 is 8631201921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 293380 + ... + 297747.

It is an arithmetic number, because the mean of its divisors is an integer number (62068440).

Almost surely, 2^1291021368 is an apocalyptic number.

It is an amenable number.

1291021368 is an abundant number, since it is smaller than the sum of its proper divisors (2681358792).

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

1291021368 is a wasteful number, since it uses less digits than its factorization.

1291021368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591156 (or 591152 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 1291021368 is about 35930.7857971406. The cubic root of 1291021368 is about 1088.8744569300.

The spelling of 1291021368 in words is "one billion, two hundred ninety-one million, twenty-one thousand, three hundred sixty-eight".