136384921 has 2 divisors, whose sum is σ = 136384922. Its totient is φ = 136384920.

The previous prime is 136384891. The next prime is 136384943. The reversal of 136384921 is 129483631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117418896 + 18966025 = 10836^2 + 4355^2 .

It is a cyclic number.

It is not a de Polignac number, because 136384921 - 2¹⁷ = 136253849 is a prime.

It is not a weakly prime, because it can be changed into another prime (136384961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68192460 + 68192461.

It is an arithmetic number, because the mean of its divisors is an integer number (68192461).

Almost surely, 2^136384921 is an apocalyptic number.

It is an amenable number.

136384921 is a deficient number, since it is larger than the sum of its proper divisors (1).

136384921 is an equidigital number, since it uses as much as digits as its factorization.

136384921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 136384921 is about 11678.3954805444. The cubic root of 136384921 is about 514.7410279317.

The spelling of 136384921 in words is "one hundred thirty-six million, three hundred eighty-four thousand, nine hundred twenty-one".