1291944499 has 4 divisors (see below), whose sum is σ = 1333620160. Its totient is φ = 1250268840.

The previous prime is 1291944487. The next prime is 1291944541. The reversal of 1291944499 is 9944491921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1291944499 - 2⁷ = 1291944371 is a prime.

It is a super-2 number, since 2×1291944499² = 3338241176992722002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1291944449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20837784 + ... + 20837845.

It is an arithmetic number, because the mean of its divisors is an integer number (333405040).

Almost surely, 2^1291944499 is an apocalyptic number.

1291944499 is a deficient number, since it is larger than the sum of its proper divisors (41675661).

1291944499 is an equidigital number, since it uses as much as digits as its factorization.

1291944499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41675660.

The product of its digits is 839808, while the sum is 52.

The square root of 1291944499 is about 35943.6294633694. The cubic root of 1291944499 is about 1089.1339244355.

The spelling of 1291944499 in words is "one billion, two hundred ninety-one million, nine hundred forty-four thousand, four hundred ninety-nine".