223256861 has 4 divisors (see below), whose sum is σ = 223301724. Its totient is φ = 223212000.

The previous prime is 223256851. The next prime is 223256867. The reversal of 223256861 is 168652322.

223256861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 148693636 + 74563225 = 12194^2 + 8635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223256861 is a prime.

It is a super-3 number, since 3×223256861³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223256867) 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, 13880 + ... + 25281.

It is an arithmetic number, because the mean of its divisors is an integer number (55825431).

Almost surely, 2^223256861 is an apocalyptic number.

It is an amenable number.

223256861 is a deficient number, since it is larger than the sum of its proper divisors (44863).

223256861 is an equidigital number, since it uses as much as digits as its factorization.

223256861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44862.

The product of its digits is 34560, while the sum is 35.

The square root of 223256861 is about 14941.7823903308. The cubic root of 223256861 is about 606.6454408640.

The spelling of 223256861 in words is "two hundred twenty-three million, two hundred fifty-six thousand, eight hundred sixty-one".