51866859 has 32 divisors (see below), whose sum is σ = 78402816. Its totient is φ = 30222720.

The previous prime is 51866831. The next prime is 51866869. The reversal of 51866859 is 95866815.

It is not a de Polignac number, because 51866859 - 2⁸ = 51866603 is a prime.

It is a super-3 number, since 3×51866859³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (51866809) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130449 + ... + 130845.

It is an arithmetic number, because the mean of its divisors is an integer number (2450088).

Almost surely, 2^51866859 is an apocalyptic number.

51866859 is a deficient number, since it is larger than the sum of its proper divisors (26535957).

51866859 is a wasteful number, since it uses less digits than its factorization.

51866859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555.

The product of its digits is 518400, while the sum is 48.

The square root of 51866859 is about 7201.8649667985. The cubic root of 51866859 is about 372.9322855513.

It can be divided in two parts, 51866 and 859, that added together give a palindrome (52725).

The spelling of 51866859 in words is "fifty-one million, eight hundred sixty-six thousand, eight hundred fifty-nine".