1329686631 has 64 divisors (see below), whose sum is σ = 2470487040. Its totient is φ = 688072320.

The previous prime is 1329686609. The next prime is 1329686647. The reversal of 1329686631 is 1366869231.

1329686631 is a `hidden beast` number, since 1 + 3 + 2 + 9 + 6 + 8 + 6 + 631 = 666.

It is not a de Polignac number, because 1329686631 - 2¹¹ = 1329684583 is a prime.

It is a super-2 number, since 2×1329686631² = 3536133073320260322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1329682631) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 125116 + ... + 135326.

It is an arithmetic number, because the mean of its divisors is an integer number (38601360).

Almost surely, 2^1329686631 is an apocalyptic number.

1329686631 is a deficient number, since it is larger than the sum of its proper divisors (1140800409).

1329686631 is a wasteful number, since it uses less digits than its factorization.

1329686631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10293 (or 10287 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 1329686631 is about 36464.8684489606. The cubic root of 1329686631 is about 1099.6380712872.

The spelling of 1329686631 in words is "one billion, three hundred twenty-nine million, six hundred eighty-six thousand, six hundred thirty-one".