856101551 has 2 divisors, whose sum is σ = 856101552. Its totient is φ = 856101550.

The previous prime is 856101529. The next prime is 856101559. The reversal of 856101551 is 155101658.

856101551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856101551 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856101559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428050775 + 428050776.

It is an arithmetic number, because the mean of its divisors is an integer number (428050776).

Almost surely, 2^856101551 is an apocalyptic number.

856101551 is a deficient number, since it is larger than the sum of its proper divisors (1).

856101551 is an equidigital number, since it uses as much as digits as its factorization.

856101551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 32.

The square root of 856101551 is about 29259.2130960489. The cubic root of 856101551 is about 949.5294256693.

The spelling of 856101551 in words is "eight hundred fifty-six million, one hundred one thousand, five hundred fifty-one".