856534969 has 2 divisors, whose sum is σ = 856534970. Its totient is φ = 856534968.

The previous prime is 856534963. The next prime is 856534979. The reversal of 856534969 is 969435658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 502342569 + 354192400 = 22413^2 + 18820^2 .

It is a cyclic number.

It is not a de Polignac number, because 856534969 - 2⁹ = 856534457 is a prime.

It is a super-2 number, since 2×856534969² = 1467304306239661922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (856534963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428267484 + 428267485.

It is an arithmetic number, because the mean of its divisors is an integer number (428267485).

Almost surely, 2^856534969 is an apocalyptic number.

It is an amenable number.

856534969 is a deficient number, since it is larger than the sum of its proper divisors (1).

856534969 is an equidigital number, since it uses as much as digits as its factorization.

856534969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6998400, while the sum is 55.

The square root of 856534969 is about 29266.6186806744. The cubic root of 856534969 is about 949.6896378595.

It can be divided in two parts, 8565 and 34969, that added together give a palindrome (43534).

The spelling of 856534969 in words is "eight hundred fifty-six million, five hundred thirty-four thousand, nine hundred sixty-nine".