131555029 has 2 divisors, whose sum is σ = 131555030. Its totient is φ = 131555028.

The previous prime is 131555023. The next prime is 131555033. The reversal of 131555029 is 920555131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73444900 + 58110129 = 8570^2 + 7623^2 .

It is a cyclic number.

It is not a de Polignac number, because 131555029 - 2²¹ = 129457877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131555023) 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 as a sum of consecutive naturals, namely, 65777514 + 65777515.

It is an arithmetic number, because the mean of its divisors is an integer number (65777515).

Almost surely, 2^131555029 is an apocalyptic number.

It is an amenable number.

131555029 is a deficient number, since it is larger than the sum of its proper divisors (1).

131555029 is an equidigital number, since it uses as much as digits as its factorization.

131555029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6750, while the sum is 31.

The square root of 131555029 is about 11469.7440686355. The cubic root of 131555029 is about 508.5915631701.

The spelling of 131555029 in words is "one hundred thirty-one million, five hundred fifty-five thousand, twenty-nine".