1217509201 has 4 divisors (see below), whose sum is σ = 1226268400. Its totient is φ = 1208750004.

The previous prime is 1217509199. The next prime is 1217509217. The reversal of 1217509201 is 1029057121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1029057121 = 31 ⋅33195391.

It is a cyclic number.

It is not a de Polignac number, because 1217509201 - 2¹ = 1217509199 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1217509201.

It is not an unprimeable number, because it can be changed into a prime (1217504201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4379391 + ... + 4379668.

It is an arithmetic number, because the mean of its divisors is an integer number (306567100).

Almost surely, 2^1217509201 is an apocalyptic number.

It is an amenable number.

1217509201 is a deficient number, since it is larger than the sum of its proper divisors (8759199).

1217509201 is an equidigital number, since it uses as much as digits as its factorization.

1217509201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8759198.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 1217509201 is about 34892.8244915771. The cubic root of 1217509201 is about 1067.8020508840.

The spelling of 1217509201 in words is "one billion, two hundred seventeen million, five hundred nine thousand, two hundred one".