1272991 has 2 divisors, whose sum is σ = 1272992. Its totient is φ = 1272990.

The previous prime is 1272989. The next prime is 1273001. The reversal of 1272991 is 1992721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1272991 - 2¹ = 1272989 is a prime.

Together with 1272989, it forms a pair of twin primes.

It is a Chen prime.

1272991 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1272941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636495 + 636496.

It is an arithmetic number, because the mean of its divisors is an integer number (636496).

2^1272991 is an apocalyptic number.

1272991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272991 is an equidigital number, since it uses as much as digits as its factorization.

1272991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 31.

The square root of 1272991 is about 1128.2690282021. The cubic root of 1272991 is about 108.3781610666.

The spelling of 1272991 in words is "one million, two hundred seventy-two thousand, nine hundred ninety-one".