136778773 has 2 divisors, whose sum is σ = 136778774. Its totient is φ = 136778772.

The previous prime is 136778737. The next prime is 136778797. The reversal of 136778773 is 377877631.

Together with previous prime (136778737) 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., 71605444 + 65173329 = 8462^2 + 8073^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136778773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136775773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68389386 + 68389387.

It is an arithmetic number, because the mean of its divisors is an integer number (68389387).

Almost surely, 2^136778773 is an apocalyptic number.

It is an amenable number.

136778773 is a deficient number, since it is larger than the sum of its proper divisors (1).

136778773 is an equidigital number, since it uses as much as digits as its factorization.

136778773 is an evil number, because the sum of its binary digits is even.

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

The square root of 136778773 is about 11695.2457434635. The cubic root of 136778773 is about 515.2360409799.

The spelling of 136778773 in words is "one hundred thirty-six million, seven hundred seventy-eight thousand, seven hundred seventy-three".