223681949 has 2 divisors, whose sum is σ = 223681950. Its totient is φ = 223681948.

The previous prime is 223681919. The next prime is 223681961. The reversal of 223681949 is 949186322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214183225 + 9498724 = 14635^2 + 3082^2 .

It is a cyclic number.

It is not a de Polignac number, because 223681949 - 2¹⁶ = 223616413 is a prime.

It is a super-2 number, since 2×223681949² = 100067228616877202, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223681919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111840974 + 111840975.

It is an arithmetic number, because the mean of its divisors is an integer number (111840975).

Almost surely, 2^223681949 is an apocalyptic number.

It is an amenable number.

223681949 is a deficient number, since it is larger than the sum of its proper divisors (1).

223681949 is an equidigital number, since it uses as much as digits as its factorization.

223681949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 44.

The square root of 223681949 is about 14956.0004346082. Note that the first 3 decimals coincide. The cubic root of 223681949 is about 607.0302206790.

The spelling of 223681949 in words is "two hundred twenty-three million, six hundred eighty-one thousand, nine hundred forty-nine".