231212257 has 8 divisors (see below), whose sum is σ = 246436992. Its totient is φ = 216168000.

The previous prime is 231212231. The next prime is 231212269. The reversal of 231212257 is 752212132.

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

It is a cyclic number.

It is not a de Polignac number, because 231212257 - 2²³ = 222823649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231212287) 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 7 ways as a sum of consecutive naturals, for example, 42469 + ... + 47602.

It is an arithmetic number, because the mean of its divisors is an integer number (30804624).

Almost surely, 2^231212257 is an apocalyptic number.

It is an amenable number.

231212257 is a deficient number, since it is larger than the sum of its proper divisors (15224735).

231212257 is a wasteful number, since it uses less digits than its factorization.

231212257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90239.

The product of its digits is 1680, while the sum is 25.

The square root of 231212257 is about 15205.6652929097. The cubic root of 231212257 is about 613.7671178770.

Adding to 231212257 its reverse (752212132), we get a palindrome (983424389).

The spelling of 231212257 in words is "two hundred thirty-one million, two hundred twelve thousand, two hundred fifty-seven".