231320247 has 8 divisors (see below), whose sum is σ = 313030656. Its totient is φ = 151911672.

The previous prime is 231320227. The next prime is 231320251. The reversal of 231320247 is 742023132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231320247 - 2¹⁰ = 231319223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231320227) 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 7 ways as a sum of consecutive naturals, for example, 575223 + ... + 575624.

It is an arithmetic number, because the mean of its divisors is an integer number (39128832).

Almost surely, 2^231320247 is an apocalyptic number.

231320247 is a deficient number, since it is larger than the sum of its proper divisors (81710409).

231320247 is a wasteful number, since it uses less digits than its factorization.

231320247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150917.

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 231320247 is about 15209.2158574990. The cubic root of 231320247 is about 613.8626583637.

Adding to 231320247 its reverse (742023132), we get a palindrome (973343379).

The spelling of 231320247 in words is "two hundred thirty-one million, three hundred twenty thousand, two hundred forty-seven".