1291409244 has 60 divisors (see below), whose sum is σ = 3522801744. Its totient is φ = 411751296.

The previous prime is 1291409213. The next prime is 1291409281. The reversal of 1291409244 is 4429041921.

1291409244 is a `hidden beast` number, since 1 + 2 + 9 + 1 + 409 + 244 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1291409199 and 1291409208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 79197 + ... + 94100.

Almost surely, 2^1291409244 is an apocalyptic number.

It is an amenable number.

1291409244 is an abundant number, since it is smaller than the sum of its proper divisors (2231392500).

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

1291409244 is a wasteful number, since it uses less digits than its factorization.

1291409244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173336 (or 173325 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1291409244 is about 35936.1829358656. The cubic root of 1291409244 is about 1088.9834935913.

It can be divided in two parts, 129140 and 9244, that added together give a square (138384 = 372²).

The spelling of 1291409244 in words is "one billion, two hundred ninety-one million, four hundred nine thousand, two hundred forty-four".