231553211 has 2 divisors, whose sum is σ = 231553212. Its totient is φ = 231553210.

The previous prime is 231553193. The next prime is 231553219. The reversal of 231553211 is 112355132.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231553211 - 2²² = 227358907 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231553219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115776605 + 115776606.

It is an arithmetic number, because the mean of its divisors is an integer number (115776606).

Almost surely, 2^231553211 is an apocalyptic number.

231553211 is a deficient number, since it is larger than the sum of its proper divisors (1).

231553211 is an equidigital number, since it uses as much as digits as its factorization.

231553211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 23.

The square root of 231553211 is about 15216.8725761899. The cubic root of 231553211 is about 614.0686641371.

The spelling of 231553211 in words is "two hundred thirty-one million, five hundred fifty-three thousand, two hundred eleven".