51593921 has 4 divisors (see below), whose sum is σ = 52691712. Its totient is φ = 50496132.

The previous prime is 51593917. The next prime is 51593933. The reversal of 51593921 is 12939515.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12939515 = 5 ⋅2587903.

It is a cyclic number.

It is not a de Polignac number, because 51593921 - 2² = 51593917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51553921) 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, 548825 + ... + 548918.

It is an arithmetic number, because the mean of its divisors is an integer number (13172928).

Almost surely, 2^51593921 is an apocalyptic number.

It is an amenable number.

51593921 is a deficient number, since it is larger than the sum of its proper divisors (1097791).

51593921 is a wasteful number, since it uses less digits than its factorization.

51593921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097790.

The product of its digits is 12150, while the sum is 35.

The square root of 51593921 is about 7182.8908525746. The cubic root of 51593921 is about 372.2769765380.

The spelling of 51593921 in words is "fifty-one million, five hundred ninety-three thousand, nine hundred twenty-one".