231722609 has 2 divisors, whose sum is σ = 231722610. Its totient is φ = 231722608.

The previous prime is 231722599. The next prime is 231722627. The reversal of 231722609 is 906227132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117831025 + 113891584 = 10855^2 + 10672^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231722609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231722639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115861304 + 115861305.

It is an arithmetic number, because the mean of its divisors is an integer number (115861305).

Almost surely, 2^231722609 is an apocalyptic number.

It is an amenable number.

231722609 is a deficient number, since it is larger than the sum of its proper divisors (1).

231722609 is an equidigital number, since it uses as much as digits as its factorization.

231722609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 231722609 is about 15222.4376825790. The cubic root of 231722609 is about 614.2183729187.

The spelling of 231722609 in words is "two hundred thirty-one million, seven hundred twenty-two thousand, six hundred nine".