51240142 has 16 divisors (see below), whose sum is σ = 81663120. Its totient is φ = 24029568.

The previous prime is 51240121. The next prime is 51240221. The reversal of 51240142 is 24104215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7984 + ... + 12892.

It is an arithmetic number, because the mean of its divisors is an integer number (5103945).

Almost surely, 2^51240142 is an apocalyptic number.

51240142 is a deficient number, since it is larger than the sum of its proper divisors (30422978).

51240142 is a wasteful number, since it uses less digits than its factorization.

51240142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5235.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 51240142 is about 7158.2219859404. The cubic root of 51240142 is about 371.4241243903.

Adding to 51240142 its reverse (24104215), we get a palindrome (75344357).

The spelling of 51240142 in words is "fifty-one million, two hundred forty thousand, one hundred forty-two".