1291231376 has 20 divisors (see below), whose sum is σ = 2554991232. Its totient is φ = 631878816.

The previous prime is 1291231367. The next prime is 1291231399. The reversal of 1291231376 is 6731321921.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 857780 + ... + 859283.

Almost surely, 2^1291231376 is an apocalyptic number.

1291231376 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1291231376 is a deficient number, since it is larger than the sum of its proper divisors (1263759856).

1291231376 is a wasteful number, since it uses less digits than its factorization.

1291231376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1717118 (or 1717112 counting only the distinct ones).

The product of its digits is 13608, while the sum is 35.

The square root of 1291231376 is about 35933.7080747312. The cubic root of 1291231376 is about 1088.9334954439.

The spelling of 1291231376 in words is "one billion, two hundred ninety-one million, two hundred thirty-one thousand, three hundred seventy-six".