231630621 has 4 divisors (see below), whose sum is σ = 308840832. Its totient is φ = 154420412.

The previous prime is 231630583. The next prime is 231630629. The reversal of 231630621 is 126036132.

It is a happy number.

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 231630621 - 2⁶ = 231630557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231630591 and 231630600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231630629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38605101 + ... + 38605106.

It is an arithmetic number, because the mean of its divisors is an integer number (77210208).

Almost surely, 2^231630621 is an apocalyptic number.

It is an amenable number.

231630621 is a deficient number, since it is larger than the sum of its proper divisors (77210211).

231630621 is an equidigital number, since it uses as much as digits as its factorization.

231630621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77210210.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 231630621 is about 15219.4159217757. The cubic root of 231630621 is about 614.1370857884.

Adding to 231630621 its reverse (126036132), we get a palindrome (357666753).

The spelling of 231630621 in words is "two hundred thirty-one million, six hundred thirty thousand, six hundred twenty-one".