51724641 has 4 divisors (see below), whose sum is σ = 68966192. Its totient is φ = 34483092.

The previous prime is 51724637. The next prime is 51724649. The reversal of 51724641 is 14642715.

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 not a de Polignac number, because 51724641 - 2² = 51724637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51724599 and 51724608.

It is not an unprimeable number, because it can be changed into a prime (51724649) 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, 8620771 + ... + 8620776.

It is an arithmetic number, because the mean of its divisors is an integer number (17241548).

Almost surely, 2^51724641 is an apocalyptic number.

It is an amenable number.

51724641 is a deficient number, since it is larger than the sum of its proper divisors (17241551).

51724641 is a wasteful number, since it uses less digits than its factorization.

51724641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17241550.

The product of its digits is 6720, while the sum is 30.

The square root of 51724641 is about 7191.9844966462. The cubic root of 51724641 is about 372.5911156475.

The spelling of 51724641 in words is "fifty-one million, seven hundred twenty-four thousand, six hundred forty-one".