231312550 has 24 divisors (see below), whose sum is σ = 491705136. Its totient is φ = 79307040.

The previous prime is 231312503. The next prime is 231312551. The reversal of 231312550 is 55213132.

231312550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231312551) 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, 330097 + ... + 330796.

It is an arithmetic number, because the mean of its divisors is an integer number (20487714).

Almost surely, 2^231312550 is an apocalyptic number.

231312550 is an abundant number, since it is smaller than the sum of its proper divisors (260392586).

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

231312550 is a wasteful number, since it uses less digits than its factorization.

231312550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660912 (or 660907 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 231312550 is about 15208.9628180228. The cubic root of 231312550 is about 613.8558496885.

Adding to 231312550 its reverse (55213132), we get a palindrome (286525682).

The spelling of 231312550 in words is "two hundred thirty-one million, three hundred twelve thousand, five hundred fifty".