1291663802 has 16 divisors (see below), whose sum is σ = 2276219232. Its totient is φ = 541956720.

The previous prime is 1291663783. The next prime is 1291663817. The reversal of 1291663802 is 2083661921.

It is a happy 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 7 ways as a sum of consecutive naturals, for example, 2257868 + ... + 2258439.

It is an arithmetic number, because the mean of its divisors is an integer number (142263702).

Almost surely, 2^1291663802 is an apocalyptic number.

1291663802 is a deficient number, since it is larger than the sum of its proper divisors (984555430).

1291663802 is a wasteful number, since it uses less digits than its factorization.

1291663802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4516333.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 1291663802 is about 35939.7245676702. The cubic root of 1291663802 is about 1089.0550410756.

The spelling of 1291663802 in words is "one billion, two hundred ninety-one million, six hundred sixty-three thousand, eight hundred two".