136191839 has 4 divisors (see below), whose sum is σ = 155647824. Its totient is φ = 116735856.

The previous prime is 136191827. The next prime is 136191841. The reversal of 136191839 is 938191631.

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

It is a cyclic number.

It is not a de Polignac number, because 136191839 - 2¹⁶ = 136126303 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 136191796 and 136191805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136191889) 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, 9727982 + ... + 9727995.

It is an arithmetic number, because the mean of its divisors is an integer number (38911956).

Almost surely, 2^136191839 is an apocalyptic number.

136191839 is a deficient number, since it is larger than the sum of its proper divisors (19455985).

136191839 is an equidigital number, since it uses as much as digits as its factorization.

136191839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19455984.

The product of its digits is 34992, while the sum is 41.

The square root of 136191839 is about 11670.1259204860. The cubic root of 136191839 is about 514.4980045715.

The spelling of 136191839 in words is "one hundred thirty-six million, one hundred ninety-one thousand, eight hundred thirty-nine".