1317245155 has 4 divisors (see below), whose sum is σ = 1580694192. Its totient is φ = 1053796120.

The previous prime is 1317245141. The next prime is 1317245161. The reversal of 1317245155 is 5515427131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5515427131 = 433 ⋅12737707.

It is not a de Polignac number, because 1317245155 - 2¹¹ = 1317243107 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 1317245155.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131724511 + ... + 131724520.

It is an arithmetic number, because the mean of its divisors is an integer number (395173548).

Almost surely, 2^1317245155 is an apocalyptic number.

1317245155 is a deficient number, since it is larger than the sum of its proper divisors (263449037).

1317245155 is an equidigital number, since it uses as much as digits as its factorization.

1317245155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263449036.

The product of its digits is 21000, while the sum is 34.

The square root of 1317245155 is about 36293.8721411756. The cubic root of 1317245155 is about 1096.1976581881.

The spelling of 1317245155 in words is "one billion, three hundred seventeen million, two hundred forty-five thousand, one hundred fifty-five".