51185842 has 4 divisors (see below), whose sum is σ = 76778766. Its totient is φ = 25592920.

The previous prime is 51185831. The next prime is 51185843. The reversal of 51185842 is 24858115.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 47348161 + 3837681 = 6881^2 + 1959^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51185798 and 51185807.

It is not an unprimeable number, because it can be changed into a prime (51185843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12796459 + ... + 12796462.

Almost surely, 2^51185842 is an apocalyptic number.

51185842 is a deficient number, since it is larger than the sum of its proper divisors (25592924).

51185842 is a wasteful number, since it uses less digits than its factorization.

51185842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25592923.

The product of its digits is 12800, while the sum is 34.

The square root of 51185842 is about 7154.4281392715. The cubic root of 51185842 is about 371.2928766510.

The spelling of 51185842 in words is "fifty-one million, one hundred eighty-five thousand, eight hundred forty-two".