136745621 has 2 divisors, whose sum is σ = 136745622. Its totient is φ = 136745620.

The previous prime is 136745611. The next prime is 136745627. The reversal of 136745621 is 126547631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108972721 + 27772900 = 10439^2 + 5270^2 .

It is a cyclic number.

It is not a de Polignac number, because 136745621 - 2¹⁴ = 136729237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136745627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68372810 + 68372811.

It is an arithmetic number, because the mean of its divisors is an integer number (68372811).

Almost surely, 2^136745621 is an apocalyptic number.

It is an amenable number.

136745621 is a deficient number, since it is larger than the sum of its proper divisors (1).

136745621 is an equidigital number, since it uses as much as digits as its factorization.

136745621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 35.

The square root of 136745621 is about 11693.8283295078. The cubic root of 136745621 is about 515.1944105303.

The spelling of 136745621 in words is "one hundred thirty-six million, seven hundred forty-five thousand, six hundred twenty-one".