231781468 has 36 divisors (see below), whose sum is σ = 442608040. Its totient is φ = 106106112.

The previous prime is 231781463. The next prime is 231781493. The reversal of 231781468 is 864187132.

231781468 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 231781468.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231781463) 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, 40063 + ... + 45481.

Almost surely, 2^231781468 is an apocalyptic number.

It is an amenable number.

231781468 is a deficient number, since it is larger than the sum of its proper divisors (210826572).

231781468 is a wasteful number, since it uses less digits than its factorization.

231781468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5494 (or 5475 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 231781468 is about 15224.3708572801. The cubic root of 231781468 is about 614.2703736260.

The spelling of 231781468 in words is "two hundred thirty-one million, seven hundred eighty-one thousand, four hundred sixty-eight".