1218172411 has 2 divisors, whose sum is σ = 1218172412. Its totient is φ = 1218172410.

The previous prime is 1218172393. The next prime is 1218172421. The reversal of 1218172411 is 1142718121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1218172411 - 2¹³ = 1218164219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1218172411.

It is not a weakly prime, because it can be changed into another prime (1218172421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609086205 + 609086206.

It is an arithmetic number, because the mean of its divisors is an integer number (609086206).

Almost surely, 2^1218172411 is an apocalyptic number.

1218172411 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218172411 is an equidigital number, since it uses as much as digits as its factorization.

1218172411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 896, while the sum is 28.

The square root of 1218172411 is about 34902.3267275980. The cubic root of 1218172411 is about 1067.9959025195.

The spelling of 1218172411 in words is "one billion, two hundred eighteen million, one hundred seventy-two thousand, four hundred eleven".