136011721 has 2 divisors, whose sum is σ = 136011722. Its totient is φ = 136011720.

The previous prime is 136011683. The next prime is 136011731. The reversal of 136011721 is 127110631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113316025 + 22695696 = 10645^2 + 4764^2 .

It is a cyclic number.

It is not a de Polignac number, because 136011721 - 2⁹ = 136011209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 136011692 and 136011701.

It is not a weakly prime, because it can be changed into another prime (136011731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68005860 + 68005861.

It is an arithmetic number, because the mean of its divisors is an integer number (68005861).

Almost surely, 2^136011721 is an apocalyptic number.

It is an amenable number.

136011721 is a deficient number, since it is larger than the sum of its proper divisors (1).

136011721 is an equidigital number, since it uses as much as digits as its factorization.

136011721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 136011721 is about 11662.4063125926. The cubic root of 136011721 is about 514.2710912325.

The spelling of 136011721 in words is "one hundred thirty-six million, eleven thousand, seven hundred twenty-one".