231133747 has 4 divisors (see below), whose sum is σ = 248913280. Its totient is φ = 213354216.

The previous prime is 231133699. The next prime is 231133759. The reversal of 231133747 is 747331132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231133747 - 2¹¹ = 231131699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231133447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8889747 + ... + 8889772.

It is an arithmetic number, because the mean of its divisors is an integer number (62228320).

Almost surely, 2^231133747 is an apocalyptic number.

231133747 is a deficient number, since it is larger than the sum of its proper divisors (17779533).

231133747 is a wasteful number, since it uses less digits than its factorization.

231133747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17779532.

The product of its digits is 10584, while the sum is 31.

The square root of 231133747 is about 15203.0834701385. The cubic root of 231133747 is about 613.6976401423.

Adding to 231133747 its reverse (747331132), we get a palindrome (978464879).

The spelling of 231133747 in words is "two hundred thirty-one million, one hundred thirty-three thousand, seven hundred forty-seven".