136988549 has 2 divisors, whose sum is σ = 136988550. Its totient is φ = 136988548.

The previous prime is 136988539. The next prime is 136988557. The reversal of 136988549 is 945889631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71944324 + 65044225 = 8482^2 + 8065^2 .

It is an emirp because it is prime and its reverse (945889631) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136988549 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 136988549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136988539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68494274 + 68494275.

It is an arithmetic number, because the mean of its divisors is an integer number (68494275).

Almost surely, 2^136988549 is an apocalyptic number.

It is an amenable number.

136988549 is a deficient number, since it is larger than the sum of its proper divisors (1).

136988549 is an equidigital number, since it uses as much as digits as its factorization.

136988549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 53.

The square root of 136988549 is about 11704.2107380207. The cubic root of 136988549 is about 515.4993102591.

The spelling of 136988549 in words is "one hundred thirty-six million, nine hundred eighty-eight thousand, five hundred forty-nine".