856269709 has 2 divisors, whose sum is σ = 856269710. Its totient is φ = 856269708.

The previous prime is 856269697. The next prime is 856269761. The reversal of 856269709 is 907962658.

It is a happy number.

It is an a-pointer prime, because the next prime (856269761) can be obtained adding 856269709 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 791015625 + 65254084 = 28125^2 + 8078^2 .

It is a cyclic number.

It is not a de Polignac number, because 856269709 - 2⁵ = 856269677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856264709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428134854 + 428134855.

It is an arithmetic number, because the mean of its divisors is an integer number (428134855).

Almost surely, 2^856269709 is an apocalyptic number.

It is an amenable number.

856269709 is a deficient number, since it is larger than the sum of its proper divisors (1).

856269709 is an equidigital number, since it uses as much as digits as its factorization.

856269709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 856269709 is about 29262.0865455627. The cubic root of 856269709 is about 949.5915913924.

The spelling of 856269709 in words is "eight hundred fifty-six million, two hundred sixty-nine thousand, seven hundred nine".