136510261 has 2 divisors, whose sum is σ = 136510262. Its totient is φ = 136510260.

The previous prime is 136510249. The next prime is 136510291. The reversal of 136510261 is 162015631.

136510261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132020100 + 4490161 = 11490^2 + 2119^2 .

It is a cyclic number.

It is not a de Polignac number, because 136510261 - 2²¹ = 134413109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136510211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68255130 + 68255131.

It is an arithmetic number, because the mean of its divisors is an integer number (68255131).

Almost surely, 2^136510261 is an apocalyptic number.

It is an amenable number.

136510261 is a deficient number, since it is larger than the sum of its proper divisors (1).

136510261 is an equidigital number, since it uses as much as digits as its factorization.

136510261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 136510261 is about 11683.7605675570. The cubic root of 136510261 is about 514.8986648264.

Adding to 136510261 its reverse (162015631), we get a palindrome (298525892).

The spelling of 136510261 in words is "one hundred thirty-six million, five hundred ten thousand, two hundred sixty-one".