223660981 has 2 divisors, whose sum is σ = 223660982. Its totient is φ = 223660980.

The previous prime is 223660979. The next prime is 223660991. The reversal of 223660981 is 189066322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159516900 + 64144081 = 12630^2 + 8009^2 .

It is a cyclic number.

It is not a de Polignac number, because 223660981 - 2¹ = 223660979 is a prime.

It is a super-2 number, since 2×223660981² = 100048468843764722, which contains 22 as substring.

Together with 223660979, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 223660981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223660961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111830490 + 111830491.

It is an arithmetic number, because the mean of its divisors is an integer number (111830491).

Almost surely, 2^223660981 is an apocalyptic number.

It is an amenable number.

223660981 is a deficient number, since it is larger than the sum of its proper divisors (1).

223660981 is an equidigital number, since it uses as much as digits as its factorization.

223660981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 223660981 is about 14955.2994286306. The cubic root of 223660981 is about 607.0112523664.

The spelling of 223660981 in words is "two hundred twenty-three million, six hundred sixty thousand, nine hundred eighty-one".