136139911 has 2 divisors, whose sum is σ = 136139912. Its totient is φ = 136139910.

The previous prime is 136139867. The next prime is 136139923. The reversal of 136139911 is 119931631.

It is a strong prime.

It is an emirp because it is prime and its reverse (119931631) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136139911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136139951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68069955 + 68069956.

It is an arithmetic number, because the mean of its divisors is an integer number (68069956).

Almost surely, 2^136139911 is an apocalyptic number.

136139911 is a deficient number, since it is larger than the sum of its proper divisors (1).

136139911 is an equidigital number, since it uses as much as digits as its factorization.

136139911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4374, while the sum is 34.

The square root of 136139911 is about 11667.9008823353. The cubic root of 136139911 is about 514.4326060158.

The spelling of 136139911 in words is "one hundred thirty-six million, one hundred thirty-nine thousand, nine hundred eleven".