53596721 has 4 divisors (see below), whose sum is σ = 54505200. Its totient is φ = 52688244.

The previous prime is 53596703. The next prime is 53596759. The reversal of 53596721 is 12769535.

It is a happy number.

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: 12769535 = 5 ⋅2553907.

It is a cyclic number.

It is not a de Polignac number, because 53596721 - 2¹⁰ = 53595697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53596421) 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, 454151 + ... + 454268.

It is an arithmetic number, because the mean of its divisors is an integer number (13626300).

Almost surely, 2^53596721 is an apocalyptic number.

It is an amenable number.

53596721 is a deficient number, since it is larger than the sum of its proper divisors (908479).

53596721 is an equidigital number, since it uses as much as digits as its factorization.

53596721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908478.

The product of its digits is 56700, while the sum is 38.

The square root of 53596721 is about 7320.9781450295. The cubic root of 53596721 is about 377.0330375117.

The spelling of 53596721 in words is "fifty-three million, five hundred ninety-six thousand, seven hundred twenty-one".