223655591 has 2 divisors, whose sum is σ = 223655592. Its totient is φ = 223655590.

The previous prime is 223655507. The next prime is 223655623. The reversal of 223655591 is 195556322.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223655591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223655501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111827795 + 111827796.

It is an arithmetic number, because the mean of its divisors is an integer number (111827796).

Almost surely, 2^223655591 is an apocalyptic number.

223655591 is a deficient number, since it is larger than the sum of its proper divisors (1).

223655591 is an equidigital number, since it uses as much as digits as its factorization.

223655591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81000, while the sum is 38.

The square root of 223655591 is about 14955.1192238644. The cubic root of 223655591 is about 607.0063762112.

The spelling of 223655591 in words is "two hundred twenty-three million, six hundred fifty-five thousand, five hundred ninety-one".