1217018879 has 2 divisors, whose sum is σ = 1217018880. Its totient is φ = 1217018878.

The previous prime is 1217018861. The next prime is 1217018909. The reversal of 1217018879 is 9788107121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1217018879 - 2²⁸ = 948583423 is a prime.

It is a super-2 number, since 2×1217018879² = 2962269903684833282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217018819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608509439 + 608509440.

It is an arithmetic number, because the mean of its divisors is an integer number (608509440).

Almost surely, 2^1217018879 is an apocalyptic number.

1217018879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217018879 is an equidigital number, since it uses as much as digits as its factorization.

1217018879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 44.

The square root of 1217018879 is about 34885.7976689655. The cubic root of 1217018879 is about 1067.6586879326.

The spelling of 1217018879 in words is "one billion, two hundred seventeen million, eighteen thousand, eight hundred seventy-nine".