243151609 has 2 divisors, whose sum is σ = 243151610. Its totient is φ = 243151608.

The previous prime is 243151537. The next prime is 243151639. The reversal of 243151609 is 906151342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232654009 + 10497600 = 15253^2 + 3240^2 .

It is a cyclic number.

It is not a de Polignac number, because 243151609 - 2²⁵ = 209597177 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243151639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121575804 + 121575805.

It is an arithmetic number, because the mean of its divisors is an integer number (121575805).

Almost surely, 2^243151609 is an apocalyptic number.

It is an amenable number.

243151609 is a deficient number, since it is larger than the sum of its proper divisors (1).

243151609 is an equidigital number, since it uses as much as digits as its factorization.

243151609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 243151609 is about 15593.3193708075. The cubic root of 243151609 is about 624.1548974778.

The spelling of 243151609 in words is "two hundred forty-three million, one hundred fifty-one thousand, six hundred nine".