231222555 has 12 divisors (see below), whose sum is σ = 400785840. Its totient is φ = 123318672.

The previous prime is 231222547. The next prime is 231222557. The reversal of 231222555 is 555222132.

231222555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231222555 - 2³ = 231222547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231222557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2569095 + ... + 2569184.

It is an arithmetic number, because the mean of its divisors is an integer number (33398820).

Almost surely, 2^231222555 is an apocalyptic number.

231222555 is a deficient number, since it is larger than the sum of its proper divisors (169563285).

231222555 is a wasteful number, since it uses less digits than its factorization.

231222555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5138290 (or 5138287 counting only the distinct ones).

The product of its digits is 6000, while the sum is 27.

The square root of 231222555 is about 15206.0039129286. The cubic root of 231222555 is about 613.7762299659.

Adding to 231222555 its reverse (555222132), we get a palindrome (786444687).

It can be divided in two parts, 231222 and 555, that multiplied together give a triangular number (128328210 = T₁₆₀₂₀).

The spelling of 231222555 in words is "two hundred thirty-one million, two hundred twenty-two thousand, five hundred fifty-five".