51118143 has 4 divisors (see below), whose sum is σ = 68157528. Its totient is φ = 34078760.

The previous prime is 51118139. The next prime is 51118147. The reversal of 51118143 is 34181115.

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

It is an interprime number because it is at equal distance from previous prime (51118139) and next prime (51118147).

It is a cyclic number.

It is not a de Polignac number, because 51118143 - 2² = 51118139 is a prime.

It is a super-2 number, since 2×51118143² = 5226129087536898, which contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51118147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8519688 + ... + 8519693.

It is an arithmetic number, because the mean of its divisors is an integer number (17039382).

Almost surely, 2^51118143 is an apocalyptic number.

51118143 is a deficient number, since it is larger than the sum of its proper divisors (17039385).

51118143 is a wasteful number, since it uses less digits than its factorization.

51118143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17039384.

The product of its digits is 480, while the sum is 24.

The square root of 51118143 is about 7149.6953081932. The cubic root of 51118143 is about 371.1291123143.

Adding to 51118143 its reverse (34181115), we get a palindrome (85299258).

The spelling of 51118143 in words is "fifty-one million, one hundred eighteen thousand, one hundred forty-three".