51689329 has 16 divisors (see below), whose sum is σ = 55944000. Its totient is φ = 47609856.

The previous prime is 51689327. The next prime is 51689347. The reversal of 51689329 is 92398615.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51689329 - 2¹ = 51689327 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51689321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114897 + ... + 115345.

It is an arithmetic number, because the mean of its divisors is an integer number (3496500).

Almost surely, 2^51689329 is an apocalyptic number.

It is an amenable number.

51689329 is a deficient number, since it is larger than the sum of its proper divisors (4254671).

51689329 is a wasteful number, since it uses less digits than its factorization.

51689329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624.

The product of its digits is 116640, while the sum is 43.

The square root of 51689329 is about 7189.5291222722. The cubic root of 51689329 is about 372.5063080174.

The spelling of 51689329 in words is "fifty-one million, six hundred eighty-nine thousand, three hundred twenty-nine".