136391123 has 4 divisors (see below), whose sum is σ = 148790328. Its totient is φ = 123991920.

The previous prime is 136391117. The next prime is 136391159. The reversal of 136391123 is 321193631.

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 136391123 - 2¹⁶ = 136325587 is a prime.

It is a super-2 number, since 2×136391123² = 37205076866402258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136391183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6199586 + ... + 6199607.

It is an arithmetic number, because the mean of its divisors is an integer number (37197582).

Almost surely, 2^136391123 is an apocalyptic number.

136391123 is a deficient number, since it is larger than the sum of its proper divisors (12399205).

136391123 is a wasteful number, since it uses less digits than its factorization.

136391123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12399204.

The product of its digits is 2916, while the sum is 29.

The square root of 136391123 is about 11678.6610105782. The cubic root of 136391123 is about 514.7488302983.

The spelling of 136391123 in words is "one hundred thirty-six million, three hundred ninety-one thousand, one hundred twenty-three".