1291957983 has 12 divisors (see below), whose sum is σ = 1867695960. Its totient is φ = 860597136.

The previous prime is 1291957981. The next prime is 1291957999. The reversal of 1291957983 is 3897591921.

It is not a de Polignac number, because 1291957983 - 2¹ = 1291957981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291957981) 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 11 ways as a sum of consecutive naturals, for example, 47341 + ... + 69462.

It is an arithmetic number, because the mean of its divisors is an integer number (155641330).

Almost surely, 2^1291957983 is an apocalyptic number.

1291957983 is a deficient number, since it is larger than the sum of its proper divisors (575737977).

1291957983 is a wasteful number, since it uses less digits than its factorization.

1291957983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118038 (or 118035 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 1291957983 is about 35943.8170343663. The cubic root of 1291957983 is about 1089.1377135123.

The spelling of 1291957983 in words is "one billion, two hundred ninety-one million, nine hundred fifty-seven thousand, nine hundred eighty-three".