136519021 has 2 divisors, whose sum is σ = 136519022. Its totient is φ = 136519020.

The previous prime is 136519003. The next prime is 136519063. The reversal of 136519021 is 120915631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120758121 + 15760900 = 10989^2 + 3970^2 .

It is a cyclic number.

It is not a de Polignac number, because 136519021 - 2²¹ = 134421869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136519091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68259510 + 68259511.

It is an arithmetic number, because the mean of its divisors is an integer number (68259511).

Almost surely, 2^136519021 is an apocalyptic number.

It is an amenable number.

136519021 is a deficient number, since it is larger than the sum of its proper divisors (1).

136519021 is an equidigital number, since it uses as much as digits as its factorization.

136519021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 136519021 is about 11684.1354408446. The cubic root of 136519021 is about 514.9096784449.

The spelling of 136519021 in words is "one hundred thirty-six million, five hundred nineteen thousand, twenty-one".