231621623 has 2 divisors, whose sum is σ = 231621624. Its totient is φ = 231621622.

The previous prime is 231621581. The next prime is 231621631. The reversal of 231621623 is 326126132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231621623 - 2²⁶ = 164512759 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231621592 and 231621601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231621673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115810811 + 115810812.

It is an arithmetic number, because the mean of its divisors is an integer number (115810812).

Almost surely, 2^231621623 is an apocalyptic number.

231621623 is a deficient number, since it is larger than the sum of its proper divisors (1).

231621623 is an equidigital number, since it uses as much as digits as its factorization.

231621623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

The square root of 231621623 is about 15219.1203096631. The cubic root of 231621623 is about 614.1291333610.

Adding to 231621623 its reverse (326126132), we get a palindrome (557747755).

The spelling of 231621623 in words is "two hundred thirty-one million, six hundred twenty-one thousand, six hundred twenty-three".