228544961621 has 2 divisors, whose sum is σ = 228544961622. Its totient is φ = 228544961620.

The previous prime is 228544961609. The next prime is 228544961683. The reversal of 228544961621 is 126169445822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134277540721 + 94267420900 = 366439^2 + 307030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228544961621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 228544961621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228544966621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114272480810 + 114272480811.

It is an arithmetic number, because the mean of its divisors is an integer number (114272480811).

Almost surely, 2^228544961621 is an apocalyptic number.

It is an amenable number.

228544961621 is a deficient number, since it is larger than the sum of its proper divisors (1).

228544961621 is an equidigital number, since it uses as much as digits as its factorization.

228544961621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1658880, while the sum is 50.

The spelling of 228544961621 in words is "two hundred twenty-eight billion, five hundred forty-four million, nine hundred sixty-one thousand, six hundred twenty-one".