53773721 has 4 divisors (see below), whose sum is σ = 54685200. Its totient is φ = 52862244.

The previous prime is 53773697. The next prime is 53773723. The reversal of 53773721 is 12737735.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53773721 is a prime.

It is a super-2 number, since 2×53773721² = 5783226140371682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53773723) 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, 455651 + ... + 455768.

It is an arithmetic number, because the mean of its divisors is an integer number (13671300).

Almost surely, 2^53773721 is an apocalyptic number.

It is an amenable number.

53773721 is a deficient number, since it is larger than the sum of its proper divisors (911479).

53773721 is an equidigital number, since it uses as much as digits as its factorization.

53773721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911478.

The product of its digits is 30870, while the sum is 35.

The square root of 53773721 is about 7333.0567296319. The cubic root of 53773721 is about 377.4476245626.

The spelling of 53773721 in words is "fifty-three million, seven hundred seventy-three thousand, seven hundred twenty-one".