243155279 has 2 divisors, whose sum is σ = 243155280. Its totient is φ = 243155278.

The previous prime is 243155251. The next prime is 243155317. The reversal of 243155279 is 972551342.

It is an a-pointer prime, because the next prime (243155317) can be obtained adding 243155279 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243155279 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243155779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121577639 + 121577640.

It is an arithmetic number, because the mean of its divisors is an integer number (121577640).

Almost surely, 2^243155279 is an apocalyptic number.

243155279 is a deficient number, since it is larger than the sum of its proper divisors (1).

243155279 is an equidigital number, since it uses as much as digits as its factorization.

243155279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 38.

The square root of 243155279 is about 15593.4370489639. The cubic root of 243155279 is about 624.1580376818.

The spelling of 243155279 in words is "two hundred forty-three million, one hundred fifty-five thousand, two hundred seventy-nine".