231213457 has 4 divisors (see below), whose sum is σ = 241266240. Its totient is φ = 221160676.

The previous prime is 231213443. The next prime is 231213461. The reversal of 231213457 is 754312132.

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 231213457 - 2¹⁵ = 231180689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231213467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5026357 + ... + 5026402.

It is an arithmetic number, because the mean of its divisors is an integer number (60316560).

Almost surely, 2^231213457 is an apocalyptic number.

It is an amenable number.

231213457 is a deficient number, since it is larger than the sum of its proper divisors (10052783).

231213457 is a wasteful number, since it uses less digits than its factorization.

231213457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10052782.

The product of its digits is 5040, while the sum is 28.

The square root of 231213457 is about 15205.7047518357. The cubic root of 231213457 is about 613.7681796997.

Adding to 231213457 its reverse (754312132), we get a palindrome (985525589).

The spelling of 231213457 in words is "two hundred thirty-one million, two hundred thirteen thousand, four hundred fifty-seven".