136585921 has 2 divisors, whose sum is σ = 136585922. Its totient is φ = 136585920.

The previous prime is 136585919. The next prime is 136585949. The reversal of 136585921 is 129585631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94789696 + 41796225 = 9736^2 + 6465^2 .

It is a cyclic number.

It is not a de Polignac number, because 136585921 - 2¹ = 136585919 is a prime.

Together with 136585919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (136585961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68292960 + 68292961.

It is an arithmetic number, because the mean of its divisors is an integer number (68292961).

Almost surely, 2^136585921 is an apocalyptic number.

It is an amenable number.

136585921 is a deficient number, since it is larger than the sum of its proper divisors (1).

136585921 is an equidigital number, since it uses as much as digits as its factorization.

136585921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 40.

The square root of 136585921 is about 11686.9979464360. The cubic root of 136585921 is about 514.9937737645.

The spelling of 136585921 in words is "one hundred thirty-six million, five hundred eighty-five thousand, nine hundred twenty-one".