136866871 has 2 divisors, whose sum is σ = 136866872. Its totient is φ = 136866870.

The previous prime is 136866869. The next prime is 136866883. The reversal of 136866871 is 178668631.

It is a weak prime.

It is an emirp because it is prime and its reverse (178668631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136866871 - 2¹ = 136866869 is a prime.

Together with 136866869, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136866571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68433435 + 68433436.

It is an arithmetic number, because the mean of its divisors is an integer number (68433436).

Almost surely, 2^136866871 is an apocalyptic number.

136866871 is a deficient number, since it is larger than the sum of its proper divisors (1).

136866871 is an equidigital number, since it uses as much as digits as its factorization.

136866871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 46.

The square root of 136866871 is about 11699.0115394421. The cubic root of 136866871 is about 515.3466369002.

The spelling of 136866871 in words is "one hundred thirty-six million, eight hundred sixty-six thousand, eight hundred seventy-one".