228161561 has 2 divisors, whose sum is σ = 228161562. Its totient is φ = 228161560.

The previous prime is 228161537. The next prime is 228161621. The reversal of 228161561 is 165161822.

228161561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227406400 + 755161 = 15080^2 + 869^2 .

It is a cyclic number.

It is not a de Polignac number, because 228161561 - 2⁶ = 228161497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (228161501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114080780 + 114080781.

It is an arithmetic number, because the mean of its divisors is an integer number (114080781).

Almost surely, 2^228161561 is an apocalyptic number.

It is an amenable number.

228161561 is a deficient number, since it is larger than the sum of its proper divisors (1).

228161561 is an equidigital number, since it uses as much as digits as its factorization.

228161561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 32.

The square root of 228161561 is about 15105.0177424590. The cubic root of 228161561 is about 611.0557378282.

The spelling of 228161561 in words is "two hundred twenty-eight million, one hundred sixty-one thousand, five hundred sixty-one".