51861115 has 4 divisors (see below), whose sum is σ = 62233344. Its totient is φ = 41488888.

The previous prime is 51861097. The next prime is 51861119. The reversal of 51861115 is 51116815.

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 51861115 - 2⁷ = 51860987 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, 5186107 + ... + 5186116.

It is an arithmetic number, because the mean of its divisors is an integer number (15558336).

Almost surely, 2^51861115 is an apocalyptic number.

51861115 is a deficient number, since it is larger than the sum of its proper divisors (10372229).

51861115 is a wasteful number, since it uses less digits than its factorization.

51861115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10372228.

The product of its digits is 1200, while the sum is 28.

The square root of 51861115 is about 7201.4661701629. The cubic root of 51861115 is about 372.9185182365.

The spelling of 51861115 in words is "fifty-one million, eight hundred sixty-one thousand, one hundred fifteen".