223551551 has 2 divisors, whose sum is σ = 223551552. Its totient is φ = 223551550.

The previous prime is 223551541. The next prime is 223551553. The reversal of 223551551 is 155155322.

223551551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223551551 is a prime.

Together with 223551553, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_12307637 and since 223551551 and 12307637 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223551553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111775775 + 111775776.

It is an arithmetic number, because the mean of its divisors is an integer number (111775776).

Almost surely, 2^223551551 is an apocalyptic number.

223551551 is a deficient number, since it is larger than the sum of its proper divisors (1).

223551551 is an equidigital number, since it uses as much as digits as its factorization.

223551551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7500, while the sum is 29.

The square root of 223551551 is about 14951.6404116739. The cubic root of 223551551 is about 606.9122393017.

The spelling of 223551551 in words is "two hundred twenty-three million, five hundred fifty-one thousand, five hundred fifty-one".