51530442 has 32 divisors (see below), whose sum is σ = 107975808. Its totient is φ = 16363776.

The previous prime is 51530429. The next prime is 51530449. The reversal of 51530442 is 24403515.

It is not an unprimeable number, because it can be changed into a prime (51530449) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 42598 + ... + 43790.

It is an arithmetic number, because the mean of its divisors is an integer number (3374244).

Almost surely, 2^51530442 is an apocalyptic number.

51530442 is an abundant number, since it is smaller than the sum of its proper divisors (56445366).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51530442 is a wasteful number, since it uses less digits than its factorization.

51530442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1534.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 51530442 is about 7178.4707285048. The cubic root of 51530442 is about 372.1242358778.

Adding to 51530442 its reverse (24403515), we get a palindrome (75933957).

The spelling of 51530442 in words is "fifty-one million, five hundred thirty thousand, four hundred forty-two".