228621553 has 2 divisors, whose sum is σ = 228621554. Its totient is φ = 228621552.

The previous prime is 228621539. The next prime is 228621571. The reversal of 228621553 is 355126822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171950769 + 56670784 = 13113^2 + 7528^2 .

It is a cyclic number.

It is not a de Polignac number, because 228621553 - 2⁵ = 228621521 is a prime.

It is a super-2 number, since 2×228621553² = 104535628992263618, which contains 22 as substring.

It is equal to p_12570883 and since 228621553 and 12570883 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (228628553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114310776 + 114310777.

It is an arithmetic number, because the mean of its divisors is an integer number (114310777).

Almost surely, 2^228621553 is an apocalyptic number.

It is an amenable number.

228621553 is a deficient number, since it is larger than the sum of its proper divisors (1).

228621553 is an equidigital number, since it uses as much as digits as its factorization.

228621553 is an odious number, because the sum of its binary digits is odd.

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

The square root of 228621553 is about 15120.2365391551. The cubic root of 228621553 is about 611.4661079583.

The spelling of 228621553 in words is "two hundred twenty-eight million, six hundred twenty-one thousand, five hundred fifty-three".