131729921 has 8 divisors (see below), whose sum is σ = 133783488. Its totient is φ = 129682000.

The previous prime is 131729911. The next prime is 131729929. The reversal of 131729921 is 129927131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131729921 - 2¹⁰ = 131728897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131729929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83066 + ... + 84636.

It is an arithmetic number, because the mean of its divisors is an integer number (16722936).

Almost surely, 2^131729921 is an apocalyptic number.

It is an amenable number.

131729921 is a deficient number, since it is larger than the sum of its proper divisors (2053567).

131729921 is a wasteful number, since it uses less digits than its factorization.

131729921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2823.

The product of its digits is 6804, while the sum is 35.

The square root of 131729921 is about 11477.3655949438. The cubic root of 131729921 is about 508.8168407813.

The spelling of 131729921 in words is "one hundred thirty-one million, seven hundred twenty-nine thousand, nine hundred twenty-one".