55453621 has 4 divisors (see below), whose sum is σ = 57864672. Its totient is φ = 53042572.

The previous prime is 55453591. The next prime is 55453691. The reversal of 55453621 is 12635455.

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 not a de Polignac number, because 55453621 - 2⁷ = 55453493 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 (55453691) 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, 1205491 + ... + 1205536.

It is an arithmetic number, because the mean of its divisors is an integer number (14466168).

Almost surely, 2^55453621 is an apocalyptic number.

It is an amenable number.

55453621 is a deficient number, since it is larger than the sum of its proper divisors (2411051).

55453621 is a wasteful number, since it uses less digits than its factorization.

55453621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2411050.

The product of its digits is 18000, while the sum is 31.

The square root of 55453621 is about 7446.7188076360. The cubic root of 55453621 is about 381.3378994317.

The spelling of 55453621 in words is "fifty-five million, four hundred fifty-three thousand, six hundred twenty-one".