1231684564 has 24 divisors (see below), whose sum is σ = 2414952288. Its totient is φ = 544724640.

The previous prime is 1231684537. The next prime is 1231684583. The reversal of 1231684564 is 4654861321.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376654 + ... + 379909.

It is an arithmetic number, because the mean of its divisors is an integer number (100623012).

Almost surely, 2^1231684564 is an apocalyptic number.

It is an amenable number.

1231684564 is a deficient number, since it is larger than the sum of its proper divisors (1183267724).

1231684564 is a wasteful number, since it uses less digits than its factorization.

1231684564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756615 (or 756613 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The square root of 1231684564 is about 35095.3638533639. The cubic root of 1231684564 is about 1071.9301824378.

The spelling of 1231684564 in words is "one billion, two hundred thirty-one million, six hundred eighty-four thousand, five hundred sixty-four".