231604621 has 2 divisors, whose sum is σ = 231604622. Its totient is φ = 231604620.

The previous prime is 231604619. The next prime is 231604697. The reversal of 231604621 is 126406132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230614596 + 990025 = 15186^2 + 995^2 .

It is a cyclic number.

It is not a de Polignac number, because 231604621 - 2¹ = 231604619 is a prime.

Together with 231604619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231604601) 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 as a sum of consecutive naturals, namely, 115802310 + 115802311.

It is an arithmetic number, because the mean of its divisors is an integer number (115802311).

Almost surely, 2^231604621 is an apocalyptic number.

It is an amenable number.

231604621 is a deficient number, since it is larger than the sum of its proper divisors (1).

231604621 is an equidigital number, since it uses as much as digits as its factorization.

231604621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 231604621 is about 15218.5617257348. The cubic root of 231604621 is about 614.1141064407.

The spelling of 231604621 in words is "two hundred thirty-one million, six hundred four thousand, six hundred twenty-one".