1291669841 has 12 divisors (see below), whose sum is σ = 1639151280. Its totient is φ = 1006495560.

The previous prime is 1291669817. The next prime is 1291669849. The reversal of 1291669841 is 1489661921.

It is not a de Polignac number, because 1291669841 - 2¹⁸ = 1291407697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1291669849) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1197671 + ... + 1198748.

It is an arithmetic number, because the mean of its divisors is an integer number (136595940).

Almost surely, 2^1291669841 is an apocalyptic number.

1291669841 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1291669841 is a deficient number, since it is larger than the sum of its proper divisors (347481439).

1291669841 is a wasteful number, since it uses less digits than its factorization.

1291669841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396444 (or 2396437 counting only the distinct ones).

The product of its digits is 186624, while the sum is 47.

The square root of 1291669841 is about 35939.8085832410. The cubic root of 1291669841 is about 1089.0567383163.

The spelling of 1291669841 in words is "one billion, two hundred ninety-one million, six hundred sixty-nine thousand, eight hundred forty-one".