231305550 has 48 divisors (see below), whose sum is σ = 655588992. Its totient is φ = 52869600.

The previous prime is 231305467. The next prime is 231305597. The reversal of 231305550 is 55503132.

It is a self number, because there is not a number n which added to its sum of digits gives 231305550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109096 + ... + 111195.

It is an arithmetic number, because the mean of its divisors is an integer number (13658104).

Almost surely, 2^231305550 is an apocalyptic number.

231305550 is an abundant number, since it is smaller than the sum of its proper divisors (424283442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231305550 is a wasteful number, since it uses less digits than its factorization.

231305550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220313 (or 220308 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 24.

The square root of 231305550 is about 15208.7326888206. The cubic root of 231305550 is about 613.8496574401.

Adding to 231305550 its reverse (55503132), we get a palindrome (286808682).

It can be divided in two parts, 23130 and 5550, that added together give a triangular number (28680 = T₂₃₉).

The spelling of 231305550 in words is "two hundred thirty-one million, three hundred five thousand, five hundred fifty".