856198451 has 2 divisors, whose sum is σ = 856198452. Its totient is φ = 856198450.

The previous prime is 856198433. The next prime is 856198457. The reversal of 856198451 is 154891658.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856198451 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 856198396 and 856198405.

It is not a weakly prime, because it can be changed into another prime (856198457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428099225 + 428099226.

It is an arithmetic number, because the mean of its divisors is an integer number (428099226).

Almost surely, 2^856198451 is an apocalyptic number.

856198451 is a deficient number, since it is larger than the sum of its proper divisors (1).

856198451 is an equidigital number, since it uses as much as digits as its factorization.

856198451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345600, while the sum is 47.

The square root of 856198451 is about 29260.8689378836. The cubic root of 856198451 is about 949.5652492738.

The spelling of 856198451 in words is "eight hundred fifty-six million, one hundred ninety-eight thousand, four hundred fifty-one".