851213111 has 16 divisors (see below), whose sum is σ = 980947968. Its totient is φ = 723535200.

The previous prime is 851213101. The next prime is 851213113. The reversal of 851213111 is 111312158.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851213111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851213113) 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 15 ways as a sum of consecutive naturals, for example, 690866 + ... + 692096.

It is an arithmetic number, because the mean of its divisors is an integer number (61309248).

Almost surely, 2^851213111 is an apocalyptic number.

851213111 is a deficient number, since it is larger than the sum of its proper divisors (129734857).

851213111 is a wasteful number, since it uses less digits than its factorization.

851213111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982.

The product of its digits is 240, while the sum is 23.

The square root of 851213111 is about 29175.5567384754. The cubic root of 851213111 is about 947.7186667038.

Adding to 851213111 its reverse (111312158), we get a palindrome (962525269).

The spelling of 851213111 in words is "eight hundred fifty-one million, two hundred thirteen thousand, one hundred eleven".