51851395 has 4 divisors (see below), whose sum is σ = 62221680. Its totient is φ = 41481112.

The previous prime is 51851381. The next prime is 51851417. The reversal of 51851395 is 59315815.

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 51851395 - 2¹⁷ = 51720323 is a prime.

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, 5185135 + ... + 5185144.

It is an arithmetic number, because the mean of its divisors is an integer number (15555420).

Almost surely, 2^51851395 is an apocalyptic number.

51851395 is a deficient number, since it is larger than the sum of its proper divisors (10370285).

51851395 is a wasteful number, since it uses less digits than its factorization.

51851395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10370284.

The product of its digits is 27000, while the sum is 37.

The square root of 51851395 is about 7200.7912759641. The cubic root of 51851395 is about 372.8952188630.

The spelling of 51851395 in words is "fifty-one million, eight hundred fifty-one thousand, three hundred ninety-five".