1217240195 has 4 divisors (see below), whose sum is σ = 1460688240. Its totient is φ = 973792152.

The previous prime is 1217240191. The next prime is 1217240197. The reversal of 1217240195 is 5910427121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1217240195 - 2² = 1217240191 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1217240191) 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 in 3 ways as a sum of consecutive naturals, for example, 121724015 + ... + 121724024.

It is an arithmetic number, because the mean of its divisors is an integer number (365172060).

Almost surely, 2^1217240195 is an apocalyptic number.

1217240195 is a deficient number, since it is larger than the sum of its proper divisors (243448045).

1217240195 is an equidigital number, since it uses as much as digits as its factorization.

1217240195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243448044.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 1217240195 is about 34888.9695319309. The cubic root of 1217240195 is about 1067.7234022473.

The spelling of 1217240195 in words is "one billion, two hundred seventeen million, two hundred forty thousand, one hundred ninety-five".