840256751 has 2 divisors, whose sum is σ = 840256752. Its totient is φ = 840256750.

The previous prime is 840256733. The next prime is 840256771. The reversal of 840256751 is 157652048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 840256751 - 2²⁶ = 773147887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840256771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420128375 + 420128376.

It is an arithmetic number, because the mean of its divisors is an integer number (420128376).

Almost surely, 2^840256751 is an apocalyptic number.

840256751 is a deficient number, since it is larger than the sum of its proper divisors (1).

840256751 is an equidigital number, since it uses as much as digits as its factorization.

840256751 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 840256751 is about 28987.1825295250. The cubic root of 840256751 is about 943.6349190202.

The spelling of 840256751 in words is "eight hundred forty million, two hundred fifty-six thousand, seven hundred fifty-one".