51355321 has 4 divisors (see below), whose sum is σ = 51489792. Its totient is φ = 51220852.

The previous prime is 51355319. The next prime is 51355331. The reversal of 51355321 is 12355315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51355321 - 2¹ = 51355319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51355331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66661 + ... + 67426.

It is an arithmetic number, because the mean of its divisors is an integer number (12872448).

Almost surely, 2^51355321 is an apocalyptic number.

It is an amenable number.

51355321 is a deficient number, since it is larger than the sum of its proper divisors (134471).

51355321 is a wasteful number, since it uses less digits than its factorization.

51355321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134470.

The product of its digits is 2250, while the sum is 25.

The square root of 51355321 is about 7166.2626940407. The cubic root of 51355321 is about 371.7022152471.

The spelling of 51355321 in words is "fifty-one million, three hundred fifty-five thousand, three hundred twenty-one".