51681837 has 8 divisors (see below), whose sum is σ = 70209504. Its totient is φ = 33804368.

The previous prime is 51681809. The next prime is 51681841. The reversal of 51681837 is 73818615.

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 51681837 - 2¹² = 51677741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51681795 and 51681804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51681337) 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, 162363 + ... + 162680.

It is an arithmetic number, because the mean of its divisors is an integer number (8776188).

Almost surely, 2^51681837 is an apocalyptic number.

It is an amenable number.

51681837 is a deficient number, since it is larger than the sum of its proper divisors (18527667).

51681837 is a wasteful number, since it uses less digits than its factorization.

51681837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325099.

The product of its digits is 40320, while the sum is 39.

The square root of 51681837 is about 7189.0080678770. The cubic root of 51681837 is about 372.4883097693.

The spelling of 51681837 in words is "fifty-one million, six hundred eighty-one thousand, eight hundred thirty-seven".