51754721 has 4 divisors (see below), whose sum is σ = 51775152. Its totient is φ = 51734292.

The previous prime is 51754709. The next prime is 51754739. The reversal of 51754721 is 12745715.

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: 12745715 = 5 ⋅2549143.

It is a cyclic number.

It is not a de Polignac number, because 51754721 - 2¹⁸ = 51492577 is a prime.

It is a super-2 number, since 2×51754721² = 5357102291575682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51754771) 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, 5771 + ... + 11696.

It is an arithmetic number, because the mean of its divisors is an integer number (12943788).

Almost surely, 2^51754721 is an apocalyptic number.

It is an amenable number.

51754721 is a deficient number, since it is larger than the sum of its proper divisors (20431).

51754721 is a wasteful number, since it uses less digits than its factorization.

51754721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20430.

The product of its digits is 9800, while the sum is 32.

The square root of 51754721 is about 7194.0754096687. The cubic root of 51754721 is about 372.6633273226.

The spelling of 51754721 in words is "fifty-one million, seven hundred fifty-four thousand, seven hundred twenty-one".