136391873 has 2 divisors, whose sum is σ = 136391874. Its totient is φ = 136391872.

The previous prime is 136391839. The next prime is 136391903. The reversal of 136391873 is 378193631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117137329 + 19254544 = 10823^2 + 4388^2 .

It is a cyclic number.

It is not a de Polignac number, because 136391873 - 2⁸ = 136391617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 136391873.

It is not a weakly prime, because it can be changed into another prime (136391273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68195936 + 68195937.

It is an arithmetic number, because the mean of its divisors is an integer number (68195937).

Almost surely, 2^136391873 is an apocalyptic number.

It is an amenable number.

136391873 is a deficient number, since it is larger than the sum of its proper divisors (1).

136391873 is an equidigital number, since it uses as much as digits as its factorization.

136391873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 41.

The square root of 136391873 is about 11678.6931203795. The cubic root of 136391873 is about 514.7497738126.

The spelling of 136391873 in words is "one hundred thirty-six million, three hundred ninety-one thousand, eight hundred seventy-three".