1318217247 has 40 divisors (see below), whose sum is σ = 2152351872. Its totient is φ = 800409600.

The previous prime is 1318217191. The next prime is 1318217249. The reversal of 1318217247 is 7427128131.

It is not a de Polignac number, because 1318217247 - 2⁷ = 1318217119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318217249) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 27247 + ... + 58127.

Almost surely, 2^1318217247 is an apocalyptic number.

1318217247 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1318217247 is a deficient number, since it is larger than the sum of its proper divisors (834134625).

1318217247 is a wasteful number, since it uses less digits than its factorization.

1318217247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30941 (or 30932 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 1318217247 is about 36307.2616290461. The cubic root of 1318217247 is about 1096.4672468186.

The spelling of 1318217247 in words is "one billion, three hundred eighteen million, two hundred seventeen thousand, two hundred forty-seven".