1217115507 has 4 divisors (see below), whose sum is σ = 1622820680. Its totient is φ = 811410336.

The previous prime is 1217115503. The next prime is 1217115533. The reversal of 1217115507 is 7055117121.

1217115507 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1217115507 - 2² = 1217115503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1217115503) 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, 202852582 + ... + 202852587.

It is an arithmetic number, because the mean of its divisors is an integer number (405705170).

Almost surely, 2^1217115507 is an apocalyptic number.

1217115507 is a deficient number, since it is larger than the sum of its proper divisors (405705173).

1217115507 is an equidigital number, since it uses as much as digits as its factorization.

1217115507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405705172.

The product of its (nonzero) digits is 2450, while the sum is 30.

The square root of 1217115507 is about 34887.1825603616. The cubic root of 1217115507 is about 1067.6869435867.

The spelling of 1217115507 in words is "one billion, two hundred seventeen million, one hundred fifteen thousand, five hundred seven".