223640261 has 4 divisors (see below), whose sum is σ = 240843372. Its totient is φ = 206437152.

The previous prime is 223640239. The next prime is 223640299. The reversal of 223640261 is 162046322.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48580900 + 175059361 = 6970^2 + 13231^2 .

It is a cyclic number.

It is not a de Polignac number, because 223640261 - 2¹⁴ = 223623877 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 223640261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223640561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8601536 + ... + 8601561.

It is an arithmetic number, because the mean of its divisors is an integer number (60210843).

Almost surely, 2^223640261 is an apocalyptic number.

It is an amenable number.

223640261 is a deficient number, since it is larger than the sum of its proper divisors (17203111).

223640261 is a wasteful number, since it uses less digits than its factorization.

223640261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17203110.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 223640261 is about 14954.6066815547. The cubic root of 223640261 is about 606.9925072378.

Adding to 223640261 its reverse (162046322), we get a palindrome (385686583).

The spelling of 223640261 in words is "two hundred twenty-three million, six hundred forty thousand, two hundred sixty-one".