51693121 has 8 divisors (see below), whose sum is σ = 54183744. Its totient is φ = 49222800.

The previous prime is 51693079. The next prime is 51693133. The reversal of 51693121 is 12139615.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51693121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51693121.

It is not an unprimeable number, because it can be changed into a prime (51693221) 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, 271 + ... + 10171.

It is an arithmetic number, because the mean of its divisors is an integer number (6772968).

Almost surely, 2^51693121 is an apocalyptic number.

It is an amenable number.

51693121 is a deficient number, since it is larger than the sum of its proper divisors (2490623).

51693121 is a wasteful number, since it uses less digits than its factorization.

51693121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10151.

The product of its digits is 1620, while the sum is 28.

The square root of 51693121 is about 7189.7928342895. The cubic root of 51693121 is about 372.5154169857.

The spelling of 51693121 in words is "fifty-one million, six hundred ninety-three thousand, one hundred twenty-one".