243679897 has 2 divisors, whose sum is σ = 243679898. Its totient is φ = 243679896.

The previous prime is 243679889. The next prime is 243679907. The reversal of 243679897 is 798976342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182277001 + 61402896 = 13501^2 + 7836^2 .

It is a cyclic number.

It is not a de Polignac number, because 243679897 - 2³ = 243679889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243679847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121839948 + 121839949.

It is an arithmetic number, because the mean of its divisors is an integer number (121839949).

Almost surely, 2^243679897 is an apocalyptic number.

It is an amenable number.

243679897 is a deficient number, since it is larger than the sum of its proper divisors (1).

243679897 is an equidigital number, since it uses as much as digits as its factorization.

243679897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 55.

The square root of 243679897 is about 15610.2497417562. The cubic root of 243679897 is about 624.6065978676.

The spelling of 243679897 in words is "two hundred forty-three million, six hundred seventy-nine thousand, eight hundred ninety-seven".