856914557 has 2 divisors, whose sum is σ = 856914558. Its totient is φ = 856914556.

The previous prime is 856914551. The next prime is 856914559. The reversal of 856914557 is 755419658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 810483961 + 46430596 = 28469^2 + 6814^2 .

It is a cyclic number.

It is not a de Polignac number, because 856914557 - 2¹⁴ = 856898173 is a prime.

Together with 856914559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856914551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428457278 + 428457279.

It is an arithmetic number, because the mean of its divisors is an integer number (428457279).

Almost surely, 2^856914557 is an apocalyptic number.

It is an amenable number.

856914557 is a deficient number, since it is larger than the sum of its proper divisors (1).

856914557 is an equidigital number, since it uses as much as digits as its factorization.

856914557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512000, while the sum is 50.

The square root of 856914557 is about 29273.1029615926. The cubic root of 856914557 is about 949.8299074978.

The spelling of 856914557 in words is "eight hundred fifty-six million, nine hundred fourteen thousand, five hundred fifty-seven".