136873213 has 2 divisors, whose sum is σ = 136873214. Its totient is φ = 136873212.

The previous prime is 136873201. The next prime is 136873291. The reversal of 136873213 is 312378631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133679844 + 3193369 = 11562^2 + 1787^2 .

It is a cyclic number.

It is not a de Polignac number, because 136873213 - 2⁵ = 136873181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136873013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68436606 + 68436607.

It is an arithmetic number, because the mean of its divisors is an integer number (68436607).

Almost surely, 2^136873213 is an apocalyptic number.

It is an amenable number.

136873213 is a deficient number, since it is larger than the sum of its proper divisors (1).

136873213 is an equidigital number, since it uses as much as digits as its factorization.

136873213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 136873213 is about 11699.2825848425. The cubic root of 136873213 is about 515.3545966494.

It can be divided in two parts, 13687 and 3213, that added together give a square (16900 = 130²).

The spelling of 136873213 in words is "one hundred thirty-six million, eight hundred seventy-three thousand, two hundred thirteen".