51236689 has 8 divisors (see below), whose sum is σ = 58813760. Its totient is φ = 43724016.

The previous prime is 51236687. The next prime is 51236701. The reversal of 51236689 is 98663215.

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

It is not a de Polignac number, because 51236689 - 2¹ = 51236687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51236683) 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, 14379 + ... + 17584.

It is an arithmetic number, because the mean of its divisors is an integer number (7351720).

Almost surely, 2^51236689 is an apocalyptic number.

It is an amenable number.

51236689 is a deficient number, since it is larger than the sum of its proper divisors (7577071).

51236689 is a wasteful number, since it uses less digits than its factorization.

51236689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32199.

The product of its digits is 77760, while the sum is 40.

The square root of 51236689 is about 7157.9807906979. The cubic root of 51236689 is about 371.4157809557.

The spelling of 51236689 in words is "fifty-one million, two hundred thirty-six thousand, six hundred eighty-nine".