136703221 has 2 divisors, whose sum is σ = 136703222. Its totient is φ = 136703220.

The previous prime is 136703209. The next prime is 136703227. The reversal of 136703221 is 122307631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136562596 + 140625 = 11686^2 + 375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136703221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136703227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68351610 + 68351611.

It is an arithmetic number, because the mean of its divisors is an integer number (68351611).

Almost surely, 2^136703221 is an apocalyptic number.

It is an amenable number.

136703221 is a deficient number, since it is larger than the sum of its proper divisors (1).

136703221 is an equidigital number, since it uses as much as digits as its factorization.

136703221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 136703221 is about 11692.0152668392. The cubic root of 136703221 is about 515.1411571465.

The spelling of 136703221 in words is "one hundred thirty-six million, seven hundred three thousand, two hundred twenty-one".