1318320725 has 12 divisors (see below), whose sum is σ = 1687451520. Its totient is φ = 1020634800.

The previous prime is 1318320701. The next prime is 1318320733. The reversal of 1318320725 is 5270238131.

It is not a de Polignac number, because 1318320725 - 2²² = 1314126421 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1318320691 and 1318320700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 849755 + ... + 851304.

It is an arithmetic number, because the mean of its divisors is an integer number (140620960).

Almost surely, 2^1318320725 is an apocalyptic number.

It is an amenable number.

1318320725 is a deficient number, since it is larger than the sum of its proper divisors (369130795).

1318320725 is a wasteful number, since it uses less digits than its factorization.

1318320725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701100 (or 1701095 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 1318320725 is about 36308.6866328156. The cubic root of 1318320725 is about 1096.4959363914.

Adding to 1318320725 its reverse (5270238131), we get a palindrome (6588558856).

The spelling of 1318320725 in words is "one billion, three hundred eighteen million, three hundred twenty thousand, seven hundred twenty-five".