131726621 has 4 divisors (see below), whose sum is σ = 141859452. Its totient is φ = 121593792.

The previous prime is 131726603. The next prime is 131726629. The reversal of 131726621 is 126627131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126627131 = 43 ⋅2944817.

It can be written as a sum of positive squares in 2 ways, for example, as 14784025 + 116942596 = 3845^2 + 10814^2 .

It is a cyclic number.

It is not a de Polignac number, because 131726621 - 2¹⁰ = 131725597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131726629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5066396 + ... + 5066421.

It is an arithmetic number, because the mean of its divisors is an integer number (35464863).

Almost surely, 2^131726621 is an apocalyptic number.

It is an amenable number.

131726621 is a deficient number, since it is larger than the sum of its proper divisors (10132831).

131726621 is a wasteful number, since it uses less digits than its factorization.

131726621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10132830.

The product of its digits is 3024, while the sum is 29.

The square root of 131726621 is about 11477.2218328305. The cubic root of 131726621 is about 508.8125919122.

The spelling of 131726621 in words is "one hundred thirty-one million, seven hundred twenty-six thousand, six hundred twenty-one".