1226891 has 2 divisors, whose sum is σ = 1226892. Its totient is φ = 1226890.

The previous prime is 1226867. The next prime is 1226899. The reversal of 1226891 is 1986221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1226891 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1226899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613445 + 613446.

It is an arithmetic number, because the mean of its divisors is an integer number (613446).

2^1226891 is an apocalyptic number.

1226891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226891 is an equidigital number, since it uses as much as digits as its factorization.

1226891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 1226891 is about 1107.6511183581. The cubic root of 1226891 is about 107.0537767936.

The spelling of 1226891 in words is "one million, two hundred twenty-six thousand, eight hundred ninety-one".