243411977 has 2 divisors, whose sum is σ = 243411978. Its totient is φ = 243411976.

The previous prime is 243411953. The next prime is 243411997. The reversal of 243411977 is 779114342.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191988736 + 51423241 = 13856^2 + 7171^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243411977 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243411977.

It is not a weakly prime, because it can be changed into another prime (243411997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121705988 + 121705989.

It is an arithmetic number, because the mean of its divisors is an integer number (121705989).

Almost surely, 2^243411977 is an apocalyptic number.

It is an amenable number.

243411977 is a deficient number, since it is larger than the sum of its proper divisors (1).

243411977 is an equidigital number, since it uses as much as digits as its factorization.

243411977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 38.

The square root of 243411977 is about 15601.6658405441. The cubic root of 243411977 is about 624.3776007698.

The spelling of 243411977 in words is "two hundred forty-three million, four hundred eleven thousand, nine hundred seventy-seven".