231212745 has 32 divisors (see below), whose sum is σ = 413043840. Its totient is φ = 122713920.

The previous prime is 231212743. The next prime is 231212759. The reversal of 231212745 is 547212132.

It is not a de Polignac number, because 231212745 - 2¹ = 231212743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (231212743) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24427 + ... + 32543.

It is an arithmetic number, because the mean of its divisors is an integer number (12907620).

Almost surely, 2^231212745 is an apocalyptic number.

It is an amenable number.

231212745 is a deficient number, since it is larger than the sum of its proper divisors (181831095).

231212745 is a wasteful number, since it uses less digits than its factorization.

231212745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8342 (or 8336 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 231212745 is about 15205.6813395520. The cubic root of 231212745 is about 613.7675496853.

Adding to 231212745 its reverse (547212132), we get a palindrome (778424877).

The spelling of 231212745 in words is "two hundred thirty-one million, two hundred twelve thousand, seven hundred forty-five".