51384867 has 4 divisors (see below), whose sum is σ = 68513160. Its totient is φ = 34256576.

The previous prime is 51384859. The next prime is 51384869. The reversal of 51384867 is 76848315.

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 51384867 - 2³ = 51384859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51384869) 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, 8564142 + ... + 8564147.

It is an arithmetic number, because the mean of its divisors is an integer number (17128290).

Almost surely, 2^51384867 is an apocalyptic number.

51384867 is a deficient number, since it is larger than the sum of its proper divisors (17128293).

51384867 is a wasteful number, since it uses less digits than its factorization.

51384867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17128292.

The product of its digits is 161280, while the sum is 42.

The square root of 51384867 is about 7168.3238626613. The cubic root of 51384867 is about 371.7734847733.

The spelling of 51384867 in words is "fifty-one million, three hundred eighty-four thousand, eight hundred sixty-seven".