51388143 has 4 divisors (see below), whose sum is σ = 68517528. Its totient is φ = 34258760.

The previous prime is 51388121. The next prime is 51388147. The reversal of 51388143 is 34188315.

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

It is a cyclic number.

It is not a de Polignac number, because 51388143 - 2⁸ = 51387887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51388147) 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, 8564688 + ... + 8564693.

It is an arithmetic number, because the mean of its divisors is an integer number (17129382).

Almost surely, 2^51388143 is an apocalyptic number.

51388143 is a deficient number, since it is larger than the sum of its proper divisors (17129385).

51388143 is a wasteful number, since it uses less digits than its factorization.

51388143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17129384.

The product of its digits is 11520, while the sum is 33.

The square root of 51388143 is about 7168.5523643201. The cubic root of 51388143 is about 371.7813853098.

The spelling of 51388143 in words is "fifty-one million, three hundred eighty-eight thousand, one hundred forty-three".