51396321 has 8 divisors (see below), whose sum is σ = 72559584. Its totient is φ = 32248640.

The previous prime is 51396313. The next prime is 51396353. The reversal of 51396321 is 12369315.

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 51396321 - 2³ = 51396313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51396391) 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, 503835 + ... + 503936.

It is an arithmetic number, because the mean of its divisors is an integer number (9069948).

Almost surely, 2^51396321 is an apocalyptic number.

51396321 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

51396321 is a deficient number, since it is larger than the sum of its proper divisors (21163263).

51396321 is a wasteful number, since it uses less digits than its factorization.

51396321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007791.

The product of its digits is 4860, while the sum is 30.

The square root of 51396321 is about 7169.1227496814. The cubic root of 51396321 is about 371.8011062462.

The spelling of 51396321 in words is "fifty-one million, three hundred ninety-six thousand, three hundred twenty-one".