1291112398 has 8 divisors (see below), whose sum is σ = 1946401200. Its totient is φ = 642312000.

The previous prime is 1291112371. The next prime is 1291112401. The reversal of 1291112398 is 8932111921.

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

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 3 ways as a sum of consecutive naturals, for example, 1621603 + ... + 1622398.

It is an arithmetic number, because the mean of its divisors is an integer number (243300150).

Almost surely, 2^1291112398 is an apocalyptic number.

1291112398 is a deficient number, since it is larger than the sum of its proper divisors (655288802).

1291112398 is a wasteful number, since it uses less digits than its factorization.

1291112398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3244202.

The product of its digits is 7776, while the sum is 37.

The square root of 1291112398 is about 35932.0525158249. The cubic root of 1291112398 is about 1088.9000485313.

The spelling of 1291112398 in words is "one billion, two hundred ninety-one million, one hundred twelve thousand, three hundred ninety-eight".