131978699 has 2 divisors, whose sum is σ = 131978700. Its totient is φ = 131978698.

The previous prime is 131978683. The next prime is 131978711. The reversal of 131978699 is 996879131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131978699 - 2⁴ = 131978683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131978699.

It is not a weakly prime, because it can be changed into another prime (131978659) 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, 65989349 + 65989350.

It is an arithmetic number, because the mean of its divisors is an integer number (65989350).

Almost surely, 2^131978699 is an apocalyptic number.

131978699 is a deficient number, since it is larger than the sum of its proper divisors (1).

131978699 is an equidigital number, since it uses as much as digits as its factorization.

131978699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 53.

The square root of 131978699 is about 11488.1982486376. The cubic root of 131978699 is about 509.1369473372.

The spelling of 131978699 in words is "one hundred thirty-one million, nine hundred seventy-eight thousand, six hundred ninety-nine".