51842542 has 4 divisors (see below), whose sum is σ = 77763816. Its totient is φ = 25921270.

The previous prime is 51842521. The next prime is 51842561. The reversal of 51842542 is 24524815.

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

It is a super-2 number, since 2×51842542² = 5375298322043528, which contains 22 as substring.

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 congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12960634 + ... + 12960637.

It is an arithmetic number, because the mean of its divisors is an integer number (19440954).

Almost surely, 2^51842542 is an apocalyptic number.

51842542 is a deficient number, since it is larger than the sum of its proper divisors (25921274).

51842542 is a wasteful number, since it uses less digits than its factorization.

51842542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25921273.

The product of its digits is 12800, while the sum is 31.

The square root of 51842542 is about 7200.1765256138. The cubic root of 51842542 is about 372.8739952021.

The spelling of 51842542 in words is "fifty-one million, eight hundred forty-two thousand, five hundred forty-two".