1291648 has 16 divisors (see below), whose sum is σ = 2573460. Its totient is φ = 645760.

The previous prime is 1291637. The next prime is 1291669. The reversal of 1291648 is 8461921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4918 + ... + 5173.

2^1291648 is an apocalyptic number.

It is an amenable number.

1291648 is a deficient number, since it is larger than the sum of its proper divisors (1281812).

1291648 is an equidigital number, since it uses as much as digits as its factorization.

1291648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10105 (or 10093 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 1291648 is about 1136.5069291474. The cubic root of 1291648 is about 108.9050599951.

The spelling of 1291648 in words is "one million, two hundred ninety-one thousand, six hundred forty-eight".