223591681 has 2 divisors, whose sum is σ = 223591682. Its totient is φ = 223591680.

The previous prime is 223591607. The next prime is 223591723. The reversal of 223591681 is 186195322.

223591681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117831025 + 105760656 = 10855^2 + 10284^2 .

It is a cyclic number.

It is not a de Polignac number, because 223591681 - 2¹⁵ = 223558913 is a prime.

It is a super-2 number, since 2×223591681² = 99986479624811522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 223591681.

It is not a weakly prime, because it can be changed into another prime (223691681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111795840 + 111795841.

It is an arithmetic number, because the mean of its divisors is an integer number (111795841).

Almost surely, 2^223591681 is an apocalyptic number.

It is an amenable number.

223591681 is a deficient number, since it is larger than the sum of its proper divisors (1).

223591681 is an equidigital number, since it uses as much as digits as its factorization.

223591681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 223591681 is about 14952.9823446696. The cubic root of 223591681 is about 606.9485529705.

The spelling of 223591681 in words is "two hundred twenty-three million, five hundred ninety-one thousand, six hundred eighty-one".