51686869 has 8 divisors (see below), whose sum is σ = 55741952. Its totient is φ = 47643120.

The previous prime is 51686863. The next prime is 51686879. The reversal of 51686869 is 96868615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51686869 - 2⁹ = 51686357 is a prime.

It is a super-2 number, since 2×51686869² = 5343064854046322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51686863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8284 + ... + 13114.

It is an arithmetic number, because the mean of its divisors is an integer number (6967744).

Almost surely, 2^51686869 is an apocalyptic number.

It is an amenable number.

51686869 is a deficient number, since it is larger than the sum of its proper divisors (4055083).

51686869 is a wasteful number, since it uses less digits than its factorization.

51686869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5667.

The product of its digits is 622080, while the sum is 49.

The square root of 51686869 is about 7189.3580381005. The cubic root of 51686869 is about 372.5003984801.

The spelling of 51686869 in words is "fifty-one million, six hundred eighty-six thousand, eight hundred sixty-nine".