1261943 has 2 divisors, whose sum is σ = 1261944. Its totient is φ = 1261942.

The previous prime is 1261933. The next prime is 1261963. The reversal of 1261943 is 3491621.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261943 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261913) 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, 630971 + 630972.

It is an arithmetic number, because the mean of its divisors is an integer number (630972).

2^1261943 is an apocalyptic number.

1261943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261943 is an equidigital number, since it uses as much as digits as its factorization.

1261943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 1261943 is about 1123.3623636209. The cubic root of 1261943 is about 108.0637198283.

The spelling of 1261943 in words is "one million, two hundred sixty-one thousand, nine hundred forty-three".