231399249 has 8 divisors (see below), whose sum is σ = 308927520. Its totient is φ = 154068576.

The previous prime is 231399247. The next prime is 231399263. The reversal of 231399249 is 942993132.

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

It is not a de Polignac number, because 231399249 - 2¹ = 231399247 is a prime.

It is a super-2 number, since 2×231399249² = 107091224875528002, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 231399249.

It is not an unprimeable number, because it can be changed into a prime (231399247) 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, 46644 + ... + 51365.

It is an arithmetic number, because the mean of its divisors is an integer number (38615940).

Almost surely, 2^231399249 is an apocalyptic number.

It is an amenable number.

231399249 is a deficient number, since it is larger than the sum of its proper divisors (77528271).

231399249 is an equidigital number, since it uses as much as digits as its factorization.

231399249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98799.

The product of its digits is 104976, while the sum is 42.

The square root of 231399249 is about 15211.8128111018. The cubic root of 231399249 is about 613.9325338696.

The spelling of 231399249 in words is "two hundred thirty-one million, three hundred ninety-nine thousand, two hundred forty-nine".