1316081138 has 8 divisors (see below), whose sum is σ = 1979197740. Its totient is φ = 656348560.

The previous prime is 1316081131. The next prime is 1316081141. The reversal of 1316081138 is 8311806131.

It can be written as a sum of positive squares in 2 ways, for example, as 1199721769 + 116359369 = 34637^2 + 10787^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1316081131) 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, 845033 + ... + 846588.

Almost surely, 2^1316081138 is an apocalyptic number.

1316081138 is a deficient number, since it is larger than the sum of its proper divisors (663116602).

1316081138 is a wasteful number, since it uses less digits than its factorization.

1316081138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692012.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 1316081138 is about 36277.8325978827. The cubic root of 1316081138 is about 1095.8746687674.

Adding to 1316081138 its reverse (8311806131), we get a palindrome (9627887269).

The spelling of 1316081138 in words is "one billion, three hundred sixteen million, eighty-one thousand, one hundred thirty-eight".