51687031 has 8 divisors (see below), whose sum is σ = 57450384. Its totient is φ = 46101120.

The previous prime is 51687023. The next prime is 51687043. The reversal of 51687031 is 13078615.

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 51687031 - 2³ = 51687023 is a prime.

It is a super-3 number, since 3×51687031³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51686984 and 51687002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51687061) 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, 43746 + ... + 44911.

It is an arithmetic number, because the mean of its divisors is an integer number (7181298).

Almost surely, 2^51687031 is an apocalyptic number.

51687031 is a deficient number, since it is larger than the sum of its proper divisors (5763353).

51687031 is a wasteful number, since it uses less digits than its factorization.

51687031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88721.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 51687031 is about 7189.3693047443. The cubic root of 51687031 is about 372.5007876505.

The spelling of 51687031 in words is "fifty-one million, six hundred eighty-seven thousand, thirty-one".