223747561 has 4 divisors (see below), whose sum is σ = 223780932. Its totient is φ = 223714192.

The previous prime is 223747549. The next prime is 223747567. The reversal of 223747561 is 165747322.

It is a happy number.

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 115691536 + 108056025 = 10756^2 + 10395^2 .

It is a cyclic number.

It is not a de Polignac number, because 223747561 - 2¹¹ = 223745513 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 223747561.

It is not an unprimeable number, because it can be changed into a prime (223747567) 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, 2746 + ... + 21331.

It is an arithmetic number, because the mean of its divisors is an integer number (55945233).

Almost surely, 2^223747561 is an apocalyptic number.

It is an amenable number.

223747561 is a deficient number, since it is larger than the sum of its proper divisors (33371).

223747561 is an equidigital number, since it uses as much as digits as its factorization.

223747561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33370.

The product of its digits is 70560, while the sum is 37.

The square root of 223747561 is about 14958.1937746507. The cubic root of 223747561 is about 607.0895677019.

The spelling of 223747561 in words is "two hundred twenty-three million, seven hundred forty-seven thousand, five hundred sixty-one".