51724319 has 4 divisors (see below), whose sum is σ = 54766944. Its totient is φ = 48681696.

The previous prime is 51724303. The next prime is 51724331. The reversal of 51724319 is 91342715.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91342715 = 5 ⋅18268543.

It is a cyclic number.

It is not a de Polignac number, because 51724319 - 2⁴ = 51724303 is a prime.

It is a super-2 number, since 2×51724319² = 5350810352027522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51724349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1521287 + ... + 1521320.

It is an arithmetic number, because the mean of its divisors is an integer number (13691736).

Almost surely, 2^51724319 is an apocalyptic number.

51724319 is a deficient number, since it is larger than the sum of its proper divisors (3042625).

51724319 is a wasteful number, since it uses less digits than its factorization.

51724319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3042624.

The product of its digits is 7560, while the sum is 32.

The square root of 51724319 is about 7191.9621105787. The cubic root of 51724319 is about 372.5903424855.

The spelling of 51724319 in words is "fifty-one million, seven hundred twenty-four thousand, three hundred nineteen".