51861113 has 4 divisors (see below), whose sum is σ = 54115968. Its totient is φ = 49606260.

The previous prime is 51861097. The next prime is 51861119. The reversal of 51861113 is 31116815.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51861113 - 2⁴ = 51861097 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 1127393 + ... + 1127438.

It is an arithmetic number, because the mean of its divisors is an integer number (13528992).

Almost surely, 2^51861113 is an apocalyptic number.

It is an amenable number.

51861113 is a deficient number, since it is larger than the sum of its proper divisors (2254855).

51861113 is a wasteful number, since it uses less digits than its factorization.

51861113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2254854.

The product of its digits is 720, while the sum is 26.

The square root of 51861113 is about 7201.4660313022. The cubic root of 51861113 is about 372.9185134427.

Adding to 51861113 its reverse (31116815), we get a palindrome (82977928).

The spelling of 51861113 in words is "fifty-one million, eight hundred sixty-one thousand, one hundred thirteen".