856123357 has 2 divisors, whose sum is σ = 856123358. Its totient is φ = 856123356.

The previous prime is 856123327. The next prime is 856123381. The reversal of 856123357 is 753321658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 803212281 + 52911076 = 28341^2 + 7274^2 .

It is a cyclic number.

It is not a de Polignac number, because 856123357 - 2²³ = 847734749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856123327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428061678 + 428061679.

It is an arithmetic number, because the mean of its divisors is an integer number (428061679).

Almost surely, 2^856123357 is an apocalyptic number.

It is an amenable number.

856123357 is a deficient number, since it is larger than the sum of its proper divisors (1).

856123357 is an equidigital number, since it uses as much as digits as its factorization.

856123357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 40.

The square root of 856123357 is about 29259.5857284412. The cubic root of 856123357 is about 949.5374875100.

The spelling of 856123357 in words is "eight hundred fifty-six million, one hundred twenty-three thousand, three hundred fifty-seven".