51685877 has 4 divisors (see below), whose sum is σ = 52457376. Its totient is φ = 50914380.

The previous prime is 51685873. The next prime is 51685883. The reversal of 51685877 is 77858615.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51685877 - 2² = 51685873 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51685873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385649 + ... + 385782.

It is an arithmetic number, because the mean of its divisors is an integer number (13114344).

Almost surely, 2^51685877 is an apocalyptic number.

It is an amenable number.

51685877 is a deficient number, since it is larger than the sum of its proper divisors (771499).

51685877 is an equidigital number, since it uses as much as digits as its factorization.

51685877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771498.

The product of its digits is 470400, while the sum is 47.

The square root of 51685877 is about 7189.2890469086. The cubic root of 51685877 is about 372.4980153941.

The spelling of 51685877 in words is "fifty-one million, six hundred eighty-five thousand, eight hundred seventy-seven".