136521773 has 2 divisors, whose sum is σ = 136521774. Its totient is φ = 136521772.

The previous prime is 136521757. The next prime is 136521779. The reversal of 136521773 is 377125631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85784644 + 50737129 = 9262^2 + 7123^2 .

It is an emirp because it is prime and its reverse (377125631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136521773 - 2⁴ = 136521757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136521779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68260886 + 68260887.

It is an arithmetic number, because the mean of its divisors is an integer number (68260887).

Almost surely, 2^136521773 is an apocalyptic number.

It is an amenable number.

136521773 is a deficient number, since it is larger than the sum of its proper divisors (1).

136521773 is an equidigital number, since it uses as much as digits as its factorization.

136521773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26460, while the sum is 35.

The square root of 136521773 is about 11684.2532067736. The cubic root of 136521773 is about 514.9131383338.

The spelling of 136521773 in words is "one hundred thirty-six million, five hundred twenty-one thousand, seven hundred seventy-three".