51686975 has 6 divisors (see below), whose sum is σ = 64091880. Its totient is φ = 41349560.

The previous prime is 51686963. The next prime is 51686977. The reversal of 51686975 is 57968615.

It is not a de Polignac number, because 51686975 - 2⁴ = 51686959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51686977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1033715 + ... + 1033764.

It is an arithmetic number, because the mean of its divisors is an integer number (10681980).

Almost surely, 2^51686975 is an apocalyptic number.

51686975 is a deficient number, since it is larger than the sum of its proper divisors (12404905).

51686975 is a wasteful number, since it uses less digits than its factorization.

51686975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2067489 (or 2067484 counting only the distinct ones).

The product of its digits is 453600, while the sum is 47.

The square root of 51686975 is about 7189.3654101040. The cubic root of 51686975 is about 372.5006531226.

The spelling of 51686975 in words is "fifty-one million, six hundred eighty-six thousand, nine hundred seventy-five".