1231687164 has 24 divisors (see below), whose sum is σ = 2966645248. Its totient is φ = 397318320.

The previous prime is 1231687157. The next prime is 1231687181. The reversal of 1231687164 is 4617861321.

1231687164 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1655122 + ... + 1655865.

Almost surely, 2^1231687164 is an apocalyptic number.

It is an amenable number.

1231687164 is an abundant number, since it is smaller than the sum of its proper divisors (1734958084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231687164 is a wasteful number, since it uses less digits than its factorization.

1231687164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3311025 (or 3311023 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 1231687164 is about 35095.4008952740. The cubic root of 1231687164 is about 1071.9309366939.

The spelling of 1231687164 in words is "one billion, two hundred thirty-one million, six hundred eighty-seven thousand, one hundred sixty-four".