136139459 has 4 divisors (see below), whose sum is σ = 136226304. Its totient is φ = 136052616.

The previous prime is 136139449. The next prime is 136139467. The reversal of 136139459 is 954931631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136139459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136139429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41027 + ... + 44220.

It is an arithmetic number, because the mean of its divisors is an integer number (34056576).

Almost surely, 2^136139459 is an apocalyptic number.

136139459 is a deficient number, since it is larger than the sum of its proper divisors (86845).

136139459 is an equidigital number, since it uses as much as digits as its factorization.

136139459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86844.

The product of its digits is 87480, while the sum is 41.

The square root of 136139459 is about 11667.8815129397. The cubic root of 136139459 is about 514.4320366903.

The spelling of 136139459 in words is "one hundred thirty-six million, one hundred thirty-nine thousand, four hundred fifty-nine".