228553621 has 4 divisors (see below), whose sum is σ = 233416512. Its totient is φ = 223690732.

The previous prime is 228553609. The next prime is 228553667. The reversal of 228553621 is 126355822.

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 228553621 - 2¹¹ = 228551573 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 (228553121) 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, 2431375 + ... + 2431468.

It is an arithmetic number, because the mean of its divisors is an integer number (58354128).

Almost surely, 2^228553621 is an apocalyptic number.

It is an amenable number.

228553621 is a deficient number, since it is larger than the sum of its proper divisors (4862891).

228553621 is an equidigital number, since it uses as much as digits as its factorization.

228553621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4862890.

The product of its digits is 28800, while the sum is 34.

The square root of 228553621 is about 15117.9899788299. The cubic root of 228553621 is about 611.4055388213.

The spelling of 228553621 in words is "two hundred twenty-eight million, five hundred fifty-three thousand, six hundred twenty-one".