51781695 has 16 divisors (see below), whose sum is σ = 94686720. Its totient is φ = 23671584.

The previous prime is 51781673. The next prime is 51781703. The reversal of 51781695 is 59618715.

It is not a de Polignac number, because 51781695 - 2⁷ = 51781567 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246475 + ... + 246684.

It is an arithmetic number, because the mean of its divisors is an integer number (5917920).

Almost surely, 2^51781695 is an apocalyptic number.

51781695 is a deficient number, since it is larger than the sum of its proper divisors (42905025).

51781695 is a wasteful number, since it uses less digits than its factorization.

51781695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493174.

The product of its digits is 75600, while the sum is 42.

The square root of 51781695 is about 7195.9499025494. The cubic root of 51781695 is about 372.7280587747.

The spelling of 51781695 in words is "fifty-one million, seven hundred eighty-one thousand, six hundred ninety-five".