856927697 has 2 divisors, whose sum is σ = 856927698. Its totient is φ = 856927696.

The previous prime is 856927661. The next prime is 856927763. The reversal of 856927697 is 796729658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 748788496 + 108139201 = 27364^2 + 10399^2 .

It is a cyclic number.

It is not a de Polignac number, because 856927697 - 2²² = 852733393 is a prime.

It is not a weakly prime, because it can be changed into another prime (856927297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428463848 + 428463849.

It is an arithmetic number, because the mean of its divisors is an integer number (428463849).

Almost surely, 2^856927697 is an apocalyptic number.

It is an amenable number.

856927697 is a deficient number, since it is larger than the sum of its proper divisors (1).

856927697 is an equidigital number, since it uses as much as digits as its factorization.

856927697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11430720, while the sum is 59.

The square root of 856927697 is about 29273.3273988455. The cubic root of 856927697 is about 949.8347623969.

The spelling of 856927697 in words is "eight hundred fifty-six million, nine hundred twenty-seven thousand, six hundred ninety-seven".