223681919 has 2 divisors, whose sum is σ = 223681920. Its totient is φ = 223681918.

The previous prime is 223681897. The next prime is 223681949. The reversal of 223681919 is 919186322.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 223681919 - 2⁸ = 223681663 is a prime.

It is a super-2 number, since 2×223681919² = 100067201775045122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223681949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111840959 + 111840960.

It is an arithmetic number, because the mean of its divisors is an integer number (111840960).

Almost surely, 2^223681919 is an apocalyptic number.

223681919 is a deficient number, since it is larger than the sum of its proper divisors (1).

223681919 is an equidigital number, since it uses as much as digits as its factorization.

223681919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 223681919 is about 14955.9994316662. Note that the first 3 decimals coincide. The cubic root of 223681919 is about 607.0301935409.

The spelling of 223681919 in words is "two hundred twenty-three million, six hundred eighty-one thousand, nine hundred nineteen".