1291257124 has 24 divisors (see below), whose sum is σ = 2287107648. Its totient is φ = 637826400.

The previous prime is 1291257059. The next prime is 1291257127. The reversal of 1291257124 is 4217521921.

It is a self number, because there is not a number n which added to its sum of digits gives 1291257124.

It is not an unprimeable number, because it can be changed into a prime (1291257127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193467 + ... + 200029.

It is an arithmetic number, because the mean of its divisors is an integer number (95296152).

Almost surely, 2^1291257124 is an apocalyptic number.

It is an amenable number.

1291257124 is a deficient number, since it is larger than the sum of its proper divisors (995850524).

1291257124 is a wasteful number, since it uses less digits than its factorization.

1291257124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7155 (or 7153 counting only the distinct ones).

The product of its digits is 10080, while the sum is 34.

The square root of 1291257124 is about 35934.0663437914. The cubic root of 1291257124 is about 1088.9407334116.

The spelling of 1291257124 in words is "one billion, two hundred ninety-one million, two hundred fifty-seven thousand, one hundred twenty-four".