53721373 has 4 divisors (see below), whose sum is σ = 55173340. Its totient is φ = 52269408.

The previous prime is 53721361. The next prime is 53721391. The reversal of 53721373 is 37312735.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37312735 = 5 ⋅7462547.

It can be written as a sum of positive squares in 2 ways, for example, as 33489369 + 20232004 = 5787^2 + 4498^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53721373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53721313) 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, 725928 + ... + 726001.

It is an arithmetic number, because the mean of its divisors is an integer number (13793335).

Almost surely, 2^53721373 is an apocalyptic number.

It is an amenable number.

53721373 is a deficient number, since it is larger than the sum of its proper divisors (1451967).

53721373 is a wasteful number, since it uses less digits than its factorization.

53721373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451966.

The product of its digits is 13230, while the sum is 31.

The square root of 53721373 is about 7329.4865440902. The cubic root of 53721373 is about 377.3251047212.

The spelling of 53721373 in words is "fifty-three million, seven hundred twenty-one thousand, three hundred seventy-three".