1256906941 has 2 divisors, whose sum is σ = 1256906942. Its totient is φ = 1256906940.

The previous prime is 1256906939. The next prime is 1256906953. The reversal of 1256906941 is 1496096521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 688275225 + 568631716 = 26235^2 + 23846^2 .

It is an emirp because it is prime and its reverse (1496096521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1256906941 - 2¹ = 1256906939 is a prime.

Together with 1256906939, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256906341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628453470 + 628453471.

It is an arithmetic number, because the mean of its divisors is an integer number (628453471).

Almost surely, 2^1256906941 is an apocalyptic number.

It is an amenable number.

1256906941 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256906941 is an equidigital number, since it uses as much as digits as its factorization.

1256906941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 1256906941 is about 35452.8833947255. The cubic root of 1256906941 is about 1079.1977755970.

The spelling of 1256906941 in words is "one billion, two hundred fifty-six million, nine hundred six thousand, nine hundred forty-one".