1291967 has 2 divisors, whose sum is σ = 1291968. Its totient is φ = 1291966.

The previous prime is 1291963. The next prime is 1291991. The reversal of 1291967 is 7691921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1291967 - 2² = 1291963 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645983 + 645984.

It is an arithmetic number, because the mean of its divisors is an integer number (645984).

2^1291967 is an apocalyptic number.

1291967 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291967 is an equidigital number, since it uses as much as digits as its factorization.

1291967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 35.

The square root of 1291967 is about 1136.6472627865. The cubic root of 1291967 is about 108.9140247323.

The spelling of 1291967 in words is "one million, two hundred ninety-one thousand, nine hundred sixty-seven".