231224397 has 4 divisors (see below), whose sum is σ = 308299200. Its totient is φ = 154149596.

The previous prime is 231224387. The next prime is 231224407. The reversal of 231224397 is 793422132.

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 an interprime number because it is at equal distance from previous prime (231224387) and next prime (231224407).

It is a cyclic number.

It is not a de Polignac number, because 231224397 - 2¹⁰ = 231223373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231224387) 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, 38537397 + ... + 38537402.

It is an arithmetic number, because the mean of its divisors is an integer number (77074800).

Almost surely, 2^231224397 is an apocalyptic number.

It is an amenable number.

231224397 is a deficient number, since it is larger than the sum of its proper divisors (77074803).

231224397 is an equidigital number, since it uses as much as digits as its factorization.

231224397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77074802.

The product of its digits is 18144, while the sum is 33.

The square root of 231224397 is about 15206.0644809892. The cubic root of 231224397 is about 613.7778598139. Note that the first 3 decimals are identical.

The spelling of 231224397 in words is "two hundred thirty-one million, two hundred twenty-four thousand, three hundred ninety-seven".