131629681 has 4 divisors (see below), whose sum is σ = 131686132. Its totient is φ = 131573232.

The previous prime is 131629633. The next prime is 131629699. The reversal of 131629681 is 186926131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69472225 + 62157456 = 8335^2 + 7884^2 .

It is a cyclic number.

It is not a de Polignac number, because 131629681 - 2¹³ = 131621489 is a prime.

It is a super-2 number, since 2×131629681² = 34652745840323522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131629681.

It is not an unprimeable number, because it can be changed into a prime (131629481) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 24570 + ... + 29443.

It is an arithmetic number, because the mean of its divisors is an integer number (32921533).

Almost surely, 2^131629681 is an apocalyptic number.

It is an amenable number.

131629681 is a deficient number, since it is larger than the sum of its proper divisors (56451).

131629681 is an equidigital number, since it uses as much as digits as its factorization.

131629681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56450.

The product of its digits is 15552, while the sum is 37.

The square root of 131629681 is about 11472.9979081319. The cubic root of 131629681 is about 508.6877464892.

The spelling of 131629681 in words is "one hundred thirty-one million, six hundred twenty-nine thousand, six hundred eighty-one".