1217420969 has 2 divisors, whose sum is σ = 1217420970. Its totient is φ = 1217420968.

The previous prime is 1217420917. The next prime is 1217420987. The reversal of 1217420969 is 9690247121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1184185744 + 33235225 = 34412^2 + 5765^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217420969 - 2²⁰ = 1216372393 is a prime.

It is a super-2 number, since 2×1217420969² = 2964227631521797922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1217420909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608710484 + 608710485.

It is an arithmetic number, because the mean of its divisors is an integer number (608710485).

Almost surely, 2^1217420969 is an apocalyptic number.

It is an amenable number.

1217420969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217420969 is an equidigital number, since it uses as much as digits as its factorization.

1217420969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 1217420969 is about 34891.5601399536. The cubic root of 1217420969 is about 1067.7762559834.

The spelling of 1217420969 in words is "one billion, two hundred seventeen million, four hundred twenty thousand, nine hundred sixty-nine".