231609073 has 2 divisors, whose sum is σ = 231609074. Its totient is φ = 231609072.

The previous prime is 231609047. The next prime is 231609121. The reversal of 231609073 is 370906132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231557089 + 51984 = 15217^2 + 228^2 .

It is a cyclic number.

It is not a de Polignac number, because 231609073 - 2²¹ = 229511921 is a prime.

It is not a weakly prime, because it can be changed into another prime (231609013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115804536 + 115804537.

It is an arithmetic number, because the mean of its divisors is an integer number (115804537).

Almost surely, 2^231609073 is an apocalyptic number.

It is an amenable number.

231609073 is a deficient number, since it is larger than the sum of its proper divisors (1).

231609073 is an equidigital number, since it uses as much as digits as its factorization.

231609073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 231609073 is about 15218.7079937819. The cubic root of 231609073 is about 614.1180413341.

The spelling of 231609073 in words is "two hundred thirty-one million, six hundred nine thousand, seventy-three".