1318217825 has 24 divisors (see below), whose sum is σ = 1760110560. Its totient is φ = 975699200.

The previous prime is 1318217821. The next prime is 1318217843. The reversal of 1318217825 is 5287128131.

It is not a de Polignac number, because 1318217825 - 2² = 1318217821 is a prime.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (1318217821) 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 23 ways as a sum of consecutive naturals, for example, 1211 + ... + 51360.

It is an arithmetic number, because the mean of its divisors is an integer number (73337940).

Almost surely, 2^1318217825 is an apocalyptic number.

It is an amenable number.

1318217825 is a deficient number, since it is larger than the sum of its proper divisors (441892735).

1318217825 is a wasteful number, since it uses less digits than its factorization.

1318217825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52657 (or 52652 counting only the distinct ones).

The product of its digits is 26880, while the sum is 38.

The square root of 1318217825 is about 36307.2695888854. The cubic root of 1318217825 is about 1096.4674070749.

The spelling of 1318217825 in words is "one billion, three hundred eighteen million, two hundred seventeen thousand, eight hundred twenty-five".