131149661 has 2 divisors, whose sum is σ = 131149662. Its totient is φ = 131149660.

The previous prime is 131149649. The next prime is 131149729. The reversal of 131149661 is 166941131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127125625 + 4024036 = 11275^2 + 2006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131149661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131149621) 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, 65574830 + 65574831.

It is an arithmetic number, because the mean of its divisors is an integer number (65574831).

Almost surely, 2^131149661 is an apocalyptic number.

It is an amenable number.

131149661 is a deficient number, since it is larger than the sum of its proper divisors (1).

131149661 is an equidigital number, since it uses as much as digits as its factorization.

131149661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 32.

The square root of 131149661 is about 11452.0592471398. The cubic root of 131149661 is about 508.0686416536.

The spelling of 131149661 in words is "one hundred thirty-one million, one hundred forty-nine thousand, six hundred sixty-one".