51530042 has 16 divisors (see below), whose sum is σ = 80294760. Its totient is φ = 24772608.

The previous prime is 51529991. The next prime is 51530053. The reversal of 51530042 is 24003515.

It can be written as a sum of positive squares in 4 ways, for example, as 44342281 + 7187761 = 6659^2 + 2681^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51529996 and 51530023.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13178 + ... + 16634.

Almost surely, 2^51530042 is an apocalyptic number.

51530042 is a deficient number, since it is larger than the sum of its proper divisors (28764718).

51530042 is a wasteful number, since it uses less digits than its factorization.

51530042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3745.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 51530042 is about 7178.4428673634. The cubic root of 51530042 is about 372.1232730160.

Adding to 51530042 its reverse (24003515), we get a palindrome (75533557).

The spelling of 51530042 in words is "fifty-one million, five hundred thirty thousand, forty-two".