1312639187 has 16 divisors (see below), whose sum is σ = 1444608000. Its totient is φ = 1187169984.

The previous prime is 1312639147. The next prime is 1312639189. The reversal of 1312639187 is 7819362131.

It is a cyclic number.

It is not a de Polignac number, because 1312639187 - 2¹⁰ = 1312638163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1312639189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246014 + ... + 251292.

It is an arithmetic number, because the mean of its divisors is an integer number (90288000).

Almost surely, 2^1312639187 is an apocalyptic number.

1312639187 is a deficient number, since it is larger than the sum of its proper divisors (131968813).

1312639187 is a wasteful number, since it uses less digits than its factorization.

1312639187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5890.

The product of its digits is 54432, while the sum is 41.

The square root of 1312639187 is about 36230.3627776483. The cubic root of 1312639187 is about 1094.9184865964.

The spelling of 1312639187 in words is "one billion, three hundred twelve million, six hundred thirty-nine thousand, one hundred eighty-seven".