136649 has 2 divisors, whose sum is σ = 136650. Its totient is φ = 136648.

The previous prime is 136621. The next prime is 136651. The reversal of 136649 is 946631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135424 + 1225 = 368^2 + 35^2 .

It is a cyclic number.

It is not a de Polignac number, because 136649 - 2⁸ = 136393 is a prime.

Together with 136651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (136849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68324 + 68325.

It is an arithmetic number, because the mean of its divisors is an integer number (68325).

2¹³⁶⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

136649 is a deficient number, since it is larger than the sum of its proper divisors (1).

136649 is an equidigital number, since it uses as much as digits as its factorization.

136649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 136649 is about 369.6606551961. The cubic root of 136649 is about 51.5073040823.

The spelling of 136649 in words is "one hundred thirty-six thousand, six hundred forty-nine".