136261602121 has 2 divisors, whose sum is σ = 136261602122. Its totient is φ = 136261602120.

The previous prime is 136261602101. The next prime is 136261602161. The reversal of 136261602121 is 121206162631.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79039699600 + 57221902521 = 281140^2 + 239211^2 .

It is a cyclic number.

It is not a de Polignac number, because 136261602121 - 2¹⁹ = 136261077833 is a prime.

It is not a weakly prime, because it can be changed into another prime (136261602101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68130801060 + 68130801061.

It is an arithmetic number, because the mean of its divisors is an integer number (68130801061).

Almost surely, 2^136261602121 is an apocalyptic number.

It is an amenable number.

136261602121 is a deficient number, since it is larger than the sum of its proper divisors (1).

136261602121 is an equidigital number, since it uses as much as digits as its factorization.

136261602121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

Adding to 136261602121 its reverse (121206162631), we get a palindrome (257467764752).

The spelling of 136261602121 in words is "one hundred thirty-six billion, two hundred sixty-one million, six hundred two thousand, one hundred twenty-one".