131575681 has 2 divisors, whose sum is σ = 131575682. Its totient is φ = 131575680.

The previous prime is 131575679. The next prime is 131575751. The reversal of 131575681 is 186575131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98903025 + 32672656 = 9945^2 + 5716^2 .

It is a cyclic number.

It is not a de Polignac number, because 131575681 - 2¹ = 131575679 is a prime.

It is a super-2 number, since 2×131575681² = 34624319661227522, which contains 22 as substring.

Together with 131575679, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 131575681.

It is not a weakly prime, because it can be changed into another prime (131575621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65787840 + 65787841.

It is an arithmetic number, because the mean of its divisors is an integer number (65787841).

Almost surely, 2^131575681 is an apocalyptic number.

It is an amenable number.

131575681 is a deficient number, since it is larger than the sum of its proper divisors (1).

131575681 is an equidigital number, since it uses as much as digits as its factorization.

131575681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 37.

The square root of 131575681 is about 11470.6443149459. The cubic root of 131575681 is about 508.6181753122.

The spelling of 131575681 in words is "one hundred thirty-one million, five hundred seventy-five thousand, six hundred eighty-one".