855111971 has 4 divisors (see below), whose sum is σ = 977270832. Its totient is φ = 732953112.

The previous prime is 855111953. The next prime is 855111973. The reversal of 855111971 is 179111558.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 855111971 - 2¹⁰ = 855110947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855111973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61079420 + ... + 61079433.

It is an arithmetic number, because the mean of its divisors is an integer number (244317708).

Almost surely, 2^855111971 is an apocalyptic number.

855111971 is a deficient number, since it is larger than the sum of its proper divisors (122158861).

855111971 is a wasteful number, since it uses less digits than its factorization.

855111971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122158860.

The product of its digits is 12600, while the sum is 38.

The square root of 855111971 is about 29242.2976354458. The cubic root of 855111971 is about 949.1634264073.

The spelling of 855111971 in words is "eight hundred fifty-five million, one hundred eleven thousand, nine hundred seventy-one".