135672421009 has 2 divisors, whose sum is σ = 135672421010. Its totient is φ = 135672421008.

The previous prime is 135672421007. The next prime is 135672421043. The reversal of 135672421009 is 900124276531.

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., 135644890000 + 27531009 = 368300^2 + 5247^2 .

It is a cyclic number.

It is not a de Polignac number, because 135672421009 - 2¹ = 135672421007 is a prime.

Together with 135672421007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (135672421007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67836210504 + 67836210505.

It is an arithmetic number, because the mean of its divisors is an integer number (67836210505).

Almost surely, 2^135672421009 is an apocalyptic number.

It is an amenable number.

135672421009 is a deficient number, since it is larger than the sum of its proper divisors (1).

135672421009 is an equidigital number, since it uses as much as digits as its factorization.

135672421009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 135672421009 in words is "one hundred thirty-five billion, six hundred seventy-two million, four hundred twenty-one thousand, nine".