51861117 has 32 divisors (see below), whose sum is σ = 86575104. Its totient is φ = 26827200.

The previous prime is 51861097. The next prime is 51861119. The reversal of 51861117 is 71116815.

It is not a de Polignac number, because 51861117 - 2²² = 47666813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51861119) 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, 106248 + ... + 106734.

It is an arithmetic number, because the mean of its divisors is an integer number (2705472).

Almost surely, 2^51861117 is an apocalyptic number.

It is an amenable number.

51861117 is a deficient number, since it is larger than the sum of its proper divisors (34713987).

51861117 is a wasteful number, since it uses less digits than its factorization.

51861117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969.

The product of its digits is 1680, while the sum is 30.

The square root of 51861117 is about 7201.4663090235. The cubic root of 51861117 is about 372.9185230303.

It can be divided in two parts, 51 and 861117, that added together give a palindrome (861168).

The spelling of 51861117 in words is "fifty-one million, eight hundred sixty-one thousand, one hundred seventeen".