51240143 has 8 divisors (see below), whose sum is σ = 52392960. Its totient is φ = 50096920.

The previous prime is 51240121. The next prime is 51240221. The reversal of 51240143 is 34104215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51240143 - 2¹⁰ = 51239119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51240103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8996 + ... + 13542.

It is an arithmetic number, because the mean of its divisors is an integer number (6549120).

Almost surely, 2^51240143 is an apocalyptic number.

51240143 is a deficient number, since it is larger than the sum of its proper divisors (1152817).

51240143 is a wasteful number, since it uses less digits than its factorization.

51240143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4797.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 51240143 is about 7158.2220557901. Note that the first 3 decimals coincide. The cubic root of 51240143 is about 371.4241268065.

Adding to 51240143 its reverse (34104215), we get a palindrome (85344358).

The spelling of 51240143 in words is "fifty-one million, two hundred forty thousand, one hundred forty-three".