1281667 has 2 divisors, whose sum is σ = 1281668. Its totient is φ = 1281666.

The previous prime is 1281653. The next prime is 1281673. The reversal of 1281667 is 7661821.

It is a strong prime.

It is an emirp because it is prime and its reverse (7661821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1281667 is a prime.

It is not a weakly prime, because it can be changed into another prime (1281677) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640833 + 640834.

It is an arithmetic number, because the mean of its divisors is an integer number (640834).

2^1281667 is an apocalyptic number.

1281667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281667 is an equidigital number, since it uses as much as digits as its factorization.

1281667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 31.

The square root of 1281667 is about 1132.1073270675. The cubic root of 1281667 is about 108.6238189476.

The spelling of 1281667 in words is "one million, two hundred eighty-one thousand, six hundred sixty-seven".