51118042 has 4 divisors (see below), whose sum is σ = 76677066. Its totient is φ = 25559020.

The previous prime is 51118033. The next prime is 51118043. The reversal of 51118042 is 24081115.

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., 32273761 + 18844281 = 5681^2 + 4341^2 .

It is a super-2 number, since 2×51118042² = 5226108435827528, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51118043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12779509 + ... + 12779512.

Almost surely, 2^51118042 is an apocalyptic number.

51118042 is a deficient number, since it is larger than the sum of its proper divisors (25559024).

51118042 is a wasteful number, since it uses less digits than its factorization.

51118042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25559023.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 51118042 is about 7149.6882449517. The cubic root of 51118042 is about 371.1288678866.

Adding to 51118042 its reverse (24081115), we get a palindrome (75199157).

The spelling of 51118042 in words is "fifty-one million, one hundred eighteen thousand, forty-two".