136721267 has 2 divisors, whose sum is σ = 136721268. Its totient is φ = 136721266.

The previous prime is 136721251. The next prime is 136721281. The reversal of 136721267 is 762127631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136721267 - 2⁴ = 136721251 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (136721227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68360633 + 68360634.

It is an arithmetic number, because the mean of its divisors is an integer number (68360634).

Almost surely, 2^136721267 is an apocalyptic number.

136721267 is a deficient number, since it is larger than the sum of its proper divisors (1).

136721267 is an equidigital number, since it uses as much as digits as its factorization.

136721267 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 35.

The square root of 136721267 is about 11692.7869646205. The cubic root of 136721267 is about 515.1638238357.

Adding to 136721267 its reverse (762127631), we get a palindrome (898848898).

The spelling of 136721267 in words is "one hundred thirty-six million, seven hundred twenty-one thousand, two hundred sixty-seven".