854820643 has 2 divisors, whose sum is σ = 854820644. Its totient is φ = 854820642.

The previous prime is 854820613. The next prime is 854820647. The reversal of 854820643 is 346028458.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 854820643 - 2⁵ = 854820611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 854820596 and 854820605.

It is not a weakly prime, because it can be changed into another prime (854820647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427410321 + 427410322.

It is an arithmetic number, because the mean of its divisors is an integer number (427410322).

Almost surely, 2^854820643 is an apocalyptic number.

854820643 is a deficient number, since it is larger than the sum of its proper divisors (1).

854820643 is an equidigital number, since it uses as much as digits as its factorization.

854820643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 184320, while the sum is 40.

The square root of 854820643 is about 29237.3159335805. The cubic root of 854820643 is about 949.0556240374.

The spelling of 854820643 in words is "eight hundred fifty-four million, eight hundred twenty thousand, six hundred forty-three".