231120555 has 32 divisors (see below), whose sum is σ = 379524096. Its totient is φ = 120063744.

The previous prime is 231120553. The next prime is 231120557. The reversal of 231120555 is 555021132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (231120553) and next prime (231120557).

It is not a de Polignac number, because 231120555 - 2¹ = 231120553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231120553) 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 in 31 ways as a sum of consecutive naturals, for example, 89614 + ... + 92156.

It is an arithmetic number, because the mean of its divisors is an integer number (11860128).

Almost surely, 2^231120555 is an apocalyptic number.

231120555 is a deficient number, since it is larger than the sum of its proper divisors (148403541).

231120555 is a wasteful number, since it uses less digits than its factorization.

231120555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2707.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 231120555 is about 15202.6496045920. The cubic root of 231120555 is about 613.6859642859.

Adding to 231120555 its reverse (555021132), we get a palindrome (786141687).

It can be divided in two parts, 231 and 120555, that added together give a triangular number (120786 = T₄₉₁).

The spelling of 231120555 in words is "two hundred thirty-one million, one hundred twenty thousand, five hundred fifty-five".