1306831687 has 8 divisors (see below), whose sum is σ = 1558457856. Its totient is φ = 1071439512.

The previous prime is 1306831681. The next prime is 1306831697. The reversal of 1306831687 is 7861386031.

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

It is a cyclic number.

It is not a de Polignac number, because 1306831687 - 2²³ = 1298443079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306831681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4058323 + ... + 4058644.

It is an arithmetic number, because the mean of its divisors is an integer number (194807232).

Almost surely, 2^1306831687 is an apocalyptic number.

1306831687 is a deficient number, since it is larger than the sum of its proper divisors (251626169).

1306831687 is an equidigital number, since it uses as much as digits as its factorization.

1306831687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8116997.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 1306831687 is about 36150.1270675498. The cubic root of 1306831687 is about 1093.3013527252.

The spelling of 1306831687 in words is "one billion, three hundred six million, eight hundred thirty-one thousand, six hundred eighty-seven".