51384895 has 4 divisors (see below), whose sum is σ = 61661880. Its totient is φ = 41107912.

The previous prime is 51384869. The next prime is 51384917. The reversal of 51384895 is 59848315.

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 51384895 - 2¹⁷ = 51253823 is a prime.

It is a super-2 number, since 2×51384895² = 5280814868322050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5138485 + ... + 5138494.

It is an arithmetic number, because the mean of its divisors is an integer number (15415470).

Almost surely, 2^51384895 is an apocalyptic number.

51384895 is a deficient number, since it is larger than the sum of its proper divisors (10276985).

51384895 is a wasteful number, since it uses less digits than its factorization.

51384895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10276984.

The product of its digits is 172800, while the sum is 43.

The square root of 51384895 is about 7168.3258156978. The cubic root of 51384895 is about 371.7735523007.

The spelling of 51384895 in words is "fifty-one million, three hundred eighty-four thousand, eight hundred ninety-five".