2238578561 has 2 divisors, whose sum is σ = 2238578562. Its totient is φ = 2238578560.

The previous prime is 2238578521. The next prime is 2238578567. The reversal of 2238578561 is 1658758322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2215114225 + 23464336 = 47065^2 + 4844^2 .

It is a cyclic number.

It is not a de Polignac number, because 2238578561 - 2¹⁴ = 2238562177 is a prime.

It is a super-2 number, since 2×2238578561² = 10022467947537661442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2238578567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1119289280 + 1119289281.

It is an arithmetic number, because the mean of its divisors is an integer number (1119289281).

Almost surely, 2^2238578561 is an apocalyptic number.

It is an amenable number.

2238578561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2238578561 is an equidigital number, since it uses as much as digits as its factorization.

2238578561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 47.

The square root of 2238578561 is about 47313.6191915182. The cubic root of 2238578561 is about 1308.1497023447.

The spelling of 2238578561 in words is "two billion, two hundred thirty-eight million, five hundred seventy-eight thousand, five hundred sixty-one".