51321669 has 24 divisors (see below), whose sum is σ = 80356320. Its totient is φ = 29048544.

The previous prime is 51321659. The next prime is 51321689. The reversal of 51321669 is 96612315.

It is a happy number.

51321669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51321669 - 2⁴ = 51321653 is a prime.

It is a super-2 number, since 2×51321669² = 5267827417891122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51321629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14422 + ... + 17624.

It is an arithmetic number, because the mean of its divisors is an integer number (3348180).

Almost surely, 2^51321669 is an apocalyptic number.

It is an amenable number.

51321669 is a deficient number, since it is larger than the sum of its proper divisors (29034651).

51321669 is a wasteful number, since it uses less digits than its factorization.

51321669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3329 (or 3322 counting only the distinct ones).

The product of its digits is 9720, while the sum is 33.

The square root of 51321669 is about 7163.9143629722. The cubic root of 51321669 is about 371.6210081077.

The spelling of 51321669 in words is "fifty-one million, three hundred twenty-one thousand, six hundred sixty-nine".