53450721 has 9 divisors (see below), whose sum is σ = 77238291. Its totient is φ = 35619192.

The previous prime is 53450713. The next prime is 53450753. The reversal of 53450721 is 12705435.

It is a happy number.

The square root of 53450721 is 7311.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 50339025 + 3111696 = 7095^2 + 1764^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 53450721 - 2³ = 53450713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53450711) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20715 + ... + 23151.

Almost surely, 2^53450721 is an apocalyptic number.

53450721 is the 7311-st square number.

53450721 is the 3656-th centered octagonal number.

It is an amenable number.

53450721 is a deficient number, since it is larger than the sum of its proper divisors (23787570).

53450721 is an frugal number, since it uses more digits than its factorization.

53450721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4880 (or 2440 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The cubic root of 53450721 is about 376.6903742442.

The spelling of 53450721 in words is "fifty-three million, four hundred fifty thousand, seven hundred twenty-one".