131721864 has 32 divisors (see below), whose sum is σ = 329598720. Its totient is φ = 43868096.

The previous prime is 131721847. The next prime is 131721917. The reversal of 131721864 is 468127131.

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, 40009 + ... + 43175.

It is an arithmetic number, because the mean of its divisors is an integer number (10299960).

Almost surely, 2^131721864 is an apocalyptic number.

It is an amenable number.

131721864 is an abundant number, since it is smaller than the sum of its proper divisors (197876856).

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

131721864 is a wasteful number, since it uses less digits than its factorization.

131721864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4909 (or 4905 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 131721864 is about 11477.0145943969. The cubic root of 131721864 is about 508.8064669780.

Adding to 131721864 its reverse (468127131), we get a palindrome (599848995).

The spelling of 131721864 in words is "one hundred thirty-one million, seven hundred twenty-one thousand, eight hundred sixty-four".