223215749 has 2 divisors, whose sum is σ = 223215750. Its totient is φ = 223215748.

The previous prime is 223215691. The next prime is 223215761. The reversal of 223215749 is 947512322.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184552225 + 38663524 = 13585^2 + 6218^2 .

It is a cyclic number.

It is not a de Polignac number, because 223215749 - 2⁸ = 223215493 is a prime.

It is a super-3 number, since 3×223215749³ (a number of 26 digits) contains 333 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 (223215149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111607874 + 111607875.

It is an arithmetic number, because the mean of its divisors is an integer number (111607875).

Almost surely, 2^223215749 is an apocalyptic number.

It is an amenable number.

223215749 is a deficient number, since it is larger than the sum of its proper divisors (1).

223215749 is an equidigital number, since it uses as much as digits as its factorization.

223215749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 223215749 is about 14940.4065875062. The cubic root of 223215749 is about 606.6082013389.

The spelling of 223215749 in words is "two hundred twenty-three million, two hundred fifteen thousand, seven hundred forty-nine".