231065621 has 4 divisors (see below), whose sum is σ = 234853644. Its totient is φ = 227277600.

The previous prime is 231065603. The next prime is 231065623. The reversal of 231065621 is 126560132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3478225 + 227587396 = 1865^2 + 15086^2 .

It is a cyclic number.

It is not a de Polignac number, because 231065621 - 2⁶ = 231065557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231065623) 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, 1893920 + ... + 1894041.

It is an arithmetic number, because the mean of its divisors is an integer number (58713411).

Almost surely, 2^231065621 is an apocalyptic number.

It is an amenable number.

231065621 is a deficient number, since it is larger than the sum of its proper divisors (3788023).

231065621 is an equidigital number, since it uses as much as digits as its factorization.

231065621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3788022.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 231065621 is about 15200.8427726886. The cubic root of 231065621 is about 613.6373390189.

The spelling of 231065621 in words is "two hundred thirty-one million, sixty-five thousand, six hundred twenty-one".