51568042 has 4 divisors (see below), whose sum is σ = 77352066. Its totient is φ = 25784020.

The previous prime is 51568039. The next prime is 51568043. The reversal of 51568042 is 24086515.

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., 49688401 + 1879641 = 7049^2 + 1371^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 51567995 and 51568013.

It is not an unprimeable number, because it can be changed into a prime (51568043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12892009 + ... + 12892012.

Almost surely, 2^51568042 is an apocalyptic number.

51568042 is a deficient number, since it is larger than the sum of its proper divisors (25784024).

51568042 is a wasteful number, since it uses less digits than its factorization.

51568042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25784023.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 51568042 is about 7181.0891931517. The cubic root of 51568042 is about 372.2147226462.

The spelling of 51568042 in words is "fifty-one million, five hundred sixty-eight thousand, forty-two".