1217252609 has 2 divisors, whose sum is σ = 1217252610. Its totient is φ = 1217252608.

The previous prime is 1217252593. The next prime is 1217252629. The reversal of 1217252609 is 9062527121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1135892209 + 81360400 = 33703^2 + 9020^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217252609 - 2⁴ = 1217252593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1217252629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608626304 + 608626305.

It is an arithmetic number, because the mean of its divisors is an integer number (608626305).

Almost surely, 2^1217252609 is an apocalyptic number.

It is an amenable number.

1217252609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217252609 is an equidigital number, since it uses as much as digits as its factorization.

1217252609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 1217252609 is about 34889.1474387094. The cubic root of 1217252609 is about 1067.7270319537.

The spelling of 1217252609 in words is "one billion, two hundred seventeen million, two hundred fifty-two thousand, six hundred nine".