131428279909 has 2 divisors, whose sum is σ = 131428279910. Its totient is φ = 131428279908.

The previous prime is 131428279903. The next prime is 131428279991. The reversal of 131428279909 is 909972824131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89702047009 + 41726232900 = 299503^2 + 204270^2 .

It is a cyclic number.

It is not a de Polignac number, because 131428279909 - 2⁵ = 131428279877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131428279909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131428279903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65714139954 + 65714139955.

It is an arithmetic number, because the mean of its divisors is an integer number (65714139955).

Almost surely, 2^131428279909 is an apocalyptic number.

It is an amenable number.

131428279909 is a deficient number, since it is larger than the sum of its proper divisors (1).

131428279909 is an equidigital number, since it uses as much as digits as its factorization.

131428279909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The spelling of 131428279909 in words is "one hundred thirty-one billion, four hundred twenty-eight million, two hundred seventy-nine thousand, nine hundred nine".