1217070989 has 2 divisors, whose sum is σ = 1217070990. Its totient is φ = 1217070988.

The previous prime is 1217070971. The next prime is 1217070997. The reversal of 1217070989 is 9890707121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1178754889 + 38316100 = 34333^2 + 6190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1217070989 is a prime.

It is a super-3 number, since 3×1217070989³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217070949) 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, 608535494 + 608535495.

It is an arithmetic number, because the mean of its divisors is an integer number (608535495).

Almost surely, 2^1217070989 is an apocalyptic number.

It is an amenable number.

1217070989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217070989 is an equidigital number, since it uses as much as digits as its factorization.

1217070989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 44.

The square root of 1217070989 is about 34886.5445265076. The cubic root of 1217070989 is about 1067.6739259597.

The spelling of 1217070989 in words is "one billion, two hundred seventeen million, seventy thousand, nine hundred eighty-nine".