136156231 has 4 divisors (see below), whose sum is σ = 136190232. Its totient is φ = 136122232.

The previous prime is 136156219. The next prime is 136156243. The reversal of 136156231 is 132651631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132651631 = 7 ⋅18950233.

It is an interprime number because it is at equal distance from previous prime (136156219) and next prime (136156243).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136156231 is a prime.

It is a super-2 number, since 2×136156231² = 37077038480250722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 136156231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136156201) 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, 10045 + ... + 19318.

It is an arithmetic number, because the mean of its divisors is an integer number (34047558).

Almost surely, 2^136156231 is an apocalyptic number.

136156231 is a deficient number, since it is larger than the sum of its proper divisors (34001).

136156231 is an equidigital number, since it uses as much as digits as its factorization.

136156231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34000.

The product of its digits is 3240, while the sum is 28.

The square root of 136156231 is about 11668.6002159642. The cubic root of 136156231 is about 514.4531613514.

The spelling of 136156231 in words is "one hundred thirty-six million, one hundred fifty-six thousand, two hundred thirty-one".