17218781149 has 2 divisors, whose sum is σ = 17218781150. Its totient is φ = 17218781148.

The previous prime is 17218781137. The next prime is 17218781183. The reversal of 17218781149 is 94118781271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16901300025 + 317481124 = 130005^2 + 17818^2 .

It is a cyclic number.

It is not a de Polignac number, because 17218781149 - 2¹³ = 17218772957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17218781119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8609390574 + 8609390575.

It is an arithmetic number, because the mean of its divisors is an integer number (8609390575).

Almost surely, 2^17218781149 is an apocalyptic number.

It is an amenable number.

17218781149 is a deficient number, since it is larger than the sum of its proper divisors (1).

17218781149 is an equidigital number, since it uses as much as digits as its factorization.

17218781149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 49.

The spelling of 17218781149 in words is "seventeen billion, two hundred eighteen million, seven hundred eighty-one thousand, one hundred forty-nine".