1291171924 has 12 divisors (see below), whose sum is σ = 2582343904. Its totient is φ = 553359384.

The previous prime is 1291171919. The next prime is 1291171939. The reversal of 1291171924 is 4291711921.

It is a happy number.

1291171924 is an admirable number.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23056614 + ... + 23056669.

Almost surely, 2^1291171924 is an apocalyptic number.

1291171924 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1291171924 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1291171924 is a wasteful number, since it uses less digits than its factorization.

1291171924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46113294 (or 46113292 counting only the distinct ones).

The product of its digits is 9072, while the sum is 37.

The square root of 1291171924 is about 35932.8808196615. The cubic root of 1291171924 is about 1088.9167826458.

The spelling of 1291171924 in words is "one billion, two hundred ninety-one million, one hundred seventy-one thousand, nine hundred twenty-four".