854878517 has 2 divisors, whose sum is σ = 854878518. Its totient is φ = 854878516.

The previous prime is 854878487. The next prime is 854878543. The reversal of 854878517 is 715878458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 852289636 + 2588881 = 29194^2 + 1609^2 .

It is a cyclic number.

It is not a de Polignac number, because 854878517 - 2¹² = 854874421 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 (854878547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427439258 + 427439259.

It is an arithmetic number, because the mean of its divisors is an integer number (427439259).

Almost surely, 2^854878517 is an apocalyptic number.

It is an amenable number.

854878517 is a deficient number, since it is larger than the sum of its proper divisors (1).

854878517 is an equidigital number, since it uses as much as digits as its factorization.

854878517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2508800, while the sum is 53.

The square root of 854878517 is about 29238.3056451635. The cubic root of 854878517 is about 949.0770415539.

The spelling of 854878517 in words is "eight hundred fifty-four million, eight hundred seventy-eight thousand, five hundred seventeen".