223621261 has 2 divisors, whose sum is σ = 223621262. Its totient is φ = 223621260.

The previous prime is 223621217. The next prime is 223621267. The reversal of 223621261 is 162126322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144144036 + 79477225 = 12006^2 + 8915^2 .

It is a cyclic number.

It is not a de Polignac number, because 223621261 - 2¹³ = 223613069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223621267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111810630 + 111810631.

It is an arithmetic number, because the mean of its divisors is an integer number (111810631).

Almost surely, 2^223621261 is an apocalyptic number.

It is an amenable number.

223621261 is a deficient number, since it is larger than the sum of its proper divisors (1).

223621261 is an equidigital number, since it uses as much as digits as its factorization.

223621261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 223621261 is about 14953.9714123038. The cubic root of 223621261 is about 606.9753171543.

Adding to 223621261 its reverse (162126322), we get a palindrome (385747583).

The spelling of 223621261 in words is "two hundred twenty-three million, six hundred twenty-one thousand, two hundred sixty-one".