136778737 has 2 divisors, whose sum is σ = 136778738. Its totient is φ = 136778736.

The previous prime is 136778693. The next prime is 136778773. The reversal of 136778737 is 737877631.

Together with next prime (136778773) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120099681 + 16679056 = 10959^2 + 4084^2 .

It is an emirp because it is prime and its reverse (737877631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136778737 - 2¹⁹ = 136254449 is a prime.

It is not a weakly prime, because it can be changed into another prime (136778797) 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, 68389368 + 68389369.

It is an arithmetic number, because the mean of its divisors is an integer number (68389369).

Almost surely, 2^136778737 is an apocalyptic number.

It is an amenable number.

136778737 is a deficient number, since it is larger than the sum of its proper divisors (1).

136778737 is an equidigital number, since it uses as much as digits as its factorization.

136778737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1037232, while the sum is 49.

The square root of 136778737 is about 11695.2442043764. The cubic root of 136778737 is about 515.2359957767.

The spelling of 136778737 in words is "one hundred thirty-six million, seven hundred seventy-eight thousand, seven hundred thirty-seven".