51781195 has 4 divisors (see below), whose sum is σ = 62137440. Its totient is φ = 41424952.

The previous prime is 51781181. The next prime is 51781199. The reversal of 51781195 is 59118715.

51781195 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51781195 - 2⁹ = 51780683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51781199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5178115 + ... + 5178124.

It is an arithmetic number, because the mean of its divisors is an integer number (15534360).

Almost surely, 2^51781195 is an apocalyptic number.

51781195 is a deficient number, since it is larger than the sum of its proper divisors (10356245).

51781195 is a wasteful number, since it uses less digits than its factorization.

51781195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10356244.

The product of its digits is 12600, while the sum is 37.

The square root of 51781195 is about 7195.9151607005. The cubic root of 51781195 is about 372.7268590932.

The spelling of 51781195 in words is "fifty-one million, seven hundred eighty-one thousand, one hundred ninety-five".