131878507 has 2 divisors, whose sum is σ = 131878508. Its totient is φ = 131878506.

The previous prime is 131878501. The next prime is 131878517. The reversal of 131878507 is 705878131.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131878507 - 2¹⁵ = 131845739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131878507.

It is not a weakly prime, because it can be changed into another prime (131878501) 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, 65939253 + 65939254.

It is an arithmetic number, because the mean of its divisors is an integer number (65939254).

Almost surely, 2^131878507 is an apocalyptic number.

131878507 is a deficient number, since it is larger than the sum of its proper divisors (1).

131878507 is an equidigital number, since it uses as much as digits as its factorization.

131878507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 40.

The square root of 131878507 is about 11483.8367717414. The cubic root of 131878507 is about 509.0080771398.

The spelling of 131878507 in words is "one hundred thirty-one million, eight hundred seventy-eight thousand, five hundred seven".