231512449 has 4 divisors (see below), whose sum is σ = 264585664. Its totient is φ = 198439236.

The previous prime is 231512431. The next prime is 231512453. The reversal of 231512449 is 944215132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231512449 - 2¹¹ = 231510401 is a prime.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 231512449.

It is not an unprimeable number, because it can be changed into a prime (231516449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16536597 + ... + 16536610.

It is an arithmetic number, because the mean of its divisors is an integer number (66146416).

Almost surely, 2^231512449 is an apocalyptic number.

It is an amenable number.

231512449 is a deficient number, since it is larger than the sum of its proper divisors (33073215).

231512449 is an equidigital number, since it uses as much as digits as its factorization.

231512449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33073214.

The product of its digits is 8640, while the sum is 31.

The square root of 231512449 is about 15215.5331487267. The cubic root of 231512449 is about 614.0326290278.

It can be divided in two parts, 23151 and 2449, that added together give a square (25600 = 160²).

The spelling of 231512449 in words is "two hundred thirty-one million, five hundred twelve thousand, four hundred forty-nine".