1281937 has 2 divisors, whose sum is σ = 1281938. Its totient is φ = 1281936.

The previous prime is 1281899. The next prime is 1281941. The reversal of 1281937 is 7391821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1245456 + 36481 = 1116^2 + 191^2 .

It is a cyclic number.

It is not a de Polignac number, because 1281937 - 2⁷ = 1281809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1281899 and 1281908.

It is not a weakly prime, because it can be changed into another prime (1284937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640968 + 640969.

It is an arithmetic number, because the mean of its divisors is an integer number (640969).

2^1281937 is an apocalyptic number.

It is an amenable number.

1281937 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281937 is an equidigital number, since it uses as much as digits as its factorization.

1281937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 1281937 is about 1132.2265674325. The cubic root of 1281937 is about 108.6314460905.

The spelling of 1281937 in words is "one million, two hundred eighty-one thousand, nine hundred thirty-seven".