1281899 has 2 divisors, whose sum is σ = 1281900. Its totient is φ = 1281898.

The previous prime is 1281883. The next prime is 1281937. The reversal of 1281899 is 9981821.

It is an a-pointer prime, because the next prime (1281937) can be obtained adding 1281899 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1281899 - 2⁴ = 1281883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1281809) 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, 640949 + 640950.

It is an arithmetic number, because the mean of its divisors is an integer number (640950).

2^1281899 is an apocalyptic number.

1281899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281899 is an equidigital number, since it uses as much as digits as its factorization.

1281899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 38.

The square root of 1281899 is about 1132.2097862146. The cubic root of 1281899 is about 108.6303727055.

The spelling of 1281899 in words is "one million, two hundred eighty-one thousand, eight hundred ninety-nine".