55363721 has 4 divisors (see below), whose sum is σ = 63272832. Its totient is φ = 47454612.

The previous prime is 55363717. The next prime is 55363723. The reversal of 55363721 is 12736355.

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: 12736355 = 5 ⋅2547271.

It is a cyclic number.

It is not a de Polignac number, because 55363721 - 2² = 55363717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55363723) 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, 3954545 + ... + 3954558.

It is an arithmetic number, because the mean of its divisors is an integer number (15818208).

Almost surely, 2^55363721 is an apocalyptic number.

It is an amenable number.

55363721 is a deficient number, since it is larger than the sum of its proper divisors (7909111).

55363721 is an equidigital number, since it uses as much as digits as its factorization.

55363721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7909110.

The product of its digits is 18900, while the sum is 32.

The square root of 55363721 is about 7440.6801436428. The cubic root of 55363721 is about 381.1317162039.

The spelling of 55363721 in words is "fifty-five million, three hundred sixty-three thousand, seven hundred twenty-one".