131721544 has 8 divisors (see below), whose sum is σ = 246977910. Its totient is φ = 65860768.

The previous prime is 131721539. The next prime is 131721563. The reversal of 131721544 is 445127131.

131721544 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 126292644 + 5428900 = 11238^2 + 2330^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8232589 + ... + 8232604.

Almost surely, 2^131721544 is an apocalyptic number.

It is an amenable number.

131721544 is a deficient number, since it is larger than the sum of its proper divisors (115256366).

131721544 is a wasteful number, since it uses less digits than its factorization.

131721544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16465199 (or 16465195 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 131721544 is about 11477.0006534809. Note that the first 3 decimals coincide. The cubic root of 131721544 is about 508.8060549528.

Adding to 131721544 its reverse (445127131), we get a palindrome (576848675).

The spelling of 131721544 in words is "one hundred thirty-one million, seven hundred twenty-one thousand, five hundred forty-four".