136421231 has 2 divisors, whose sum is σ = 136421232. Its totient is φ = 136421230.

The previous prime is 136421221. The next prime is 136421251. The reversal of 136421231 is 132124631.

It is a weak prime.

It is an emirp because it is prime and its reverse (132124631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136421231 - 2¹⁴ = 136404847 is a prime.

It is a super-2 number, since 2×136421231² = 37221504535110722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 136421197 and 136421206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136421221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68210615 + 68210616.

It is an arithmetic number, because the mean of its divisors is an integer number (68210616).

Almost surely, 2^136421231 is an apocalyptic number.

136421231 is a deficient number, since it is larger than the sum of its proper divisors (1).

136421231 is an equidigital number, since it uses as much as digits as its factorization.

136421231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 136421231 is about 11679.9499570846. The cubic root of 136421231 is about 514.7867040182.

Adding to 136421231 its reverse (132124631), we get a palindrome (268545862).

The spelling of 136421231 in words is "one hundred thirty-six million, four hundred twenty-one thousand, two hundred thirty-one".