231224621 has 2 divisors, whose sum is σ = 231224622. Its totient is φ = 231224620.

The previous prime is 231224579. The next prime is 231224641. The reversal of 231224621 is 126422132.

It is a happy number.

231224621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190136521 + 41088100 = 13789^2 + 6410^2 .

It is a cyclic number.

It is not a de Polignac number, because 231224621 - 2⁶ = 231224557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231224641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115612310 + 115612311.

It is an arithmetic number, because the mean of its divisors is an integer number (115612311).

Almost surely, 2^231224621 is an apocalyptic number.

It is an amenable number.

231224621 is a deficient number, since it is larger than the sum of its proper divisors (1).

231224621 is an equidigital number, since it uses as much as digits as its factorization.

231224621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

The square root of 231224621 is about 15206.0718464698. The cubic root of 231224621 is about 613.7780580141.

Adding to 231224621 its reverse (126422132), we get a palindrome (357646753).

The spelling of 231224621 in words is "two hundred thirty-one million, two hundred twenty-four thousand, six hundred twenty-one".