51693969 has 8 divisors (see below), whose sum is σ = 69018912. Its totient is φ = 34415840.

The previous prime is 51693913. The next prime is 51694009. The reversal of 51693969 is 96939615.

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 51693969 - 2⁷ = 51693841 is a prime.

It is a super-2 number, since 2×51693969² = 5344532861945922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51693269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9039 + ... + 13604.

It is an arithmetic number, because the mean of its divisors is an integer number (8627364).

Almost surely, 2^51693969 is an apocalyptic number.

It is an amenable number.

51693969 is a deficient number, since it is larger than the sum of its proper divisors (17324943).

51693969 is a wasteful number, since it uses less digits than its factorization.

51693969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23407.

The product of its digits is 393660, while the sum is 48.

The square root of 51693969 is about 7189.8518065395. The cubic root of 51693969 is about 372.5174539515.

The spelling of 51693969 in words is "fifty-one million, six hundred ninety-three thousand, nine hundred sixty-nine".