135209849 has 2 divisors, whose sum is σ = 135209850. Its totient is φ = 135209848.

The previous prime is 135209839. The next prime is 135209869. The reversal of 135209849 is 948902531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122500624 + 12709225 = 11068^2 + 3565^2 .

It is a cyclic number.

It is not a de Polignac number, because 135209849 - 2⁸ = 135209593 is a prime.

It is not a weakly prime, because it can be changed into another prime (135209839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67604924 + 67604925.

It is an arithmetic number, because the mean of its divisors is an integer number (67604925).

Almost surely, 2^135209849 is an apocalyptic number.

It is an amenable number.

135209849 is a deficient number, since it is larger than the sum of its proper divisors (1).

135209849 is an equidigital number, since it uses as much as digits as its factorization.

135209849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 135209849 is about 11627.9769951613. The cubic root of 135209849 is about 513.2584513905.

The spelling of 135209849 in words is "one hundred thirty-five million, two hundred nine thousand, eight hundred forty-nine".