136494409 has 2 divisors, whose sum is σ = 136494410. Its totient is φ = 136494408.

The previous prime is 136494401. The next prime is 136494431. The reversal of 136494409 is 904494631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102819600 + 33674809 = 10140^2 + 5803^2 .

It is a cyclic number.

It is not a de Polignac number, because 136494409 - 2³ = 136494401 is a prime.

It is not a weakly prime, because it can be changed into another prime (136494401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68247204 + 68247205.

It is an arithmetic number, because the mean of its divisors is an integer number (68247205).

Almost surely, 2^136494409 is an apocalyptic number.

It is an amenable number.

136494409 is a deficient number, since it is larger than the sum of its proper divisors (1).

136494409 is an equidigital number, since it uses as much as digits as its factorization.

136494409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 136494409 is about 11683.0821703864. The cubic root of 136494409 is about 514.8787335051.

The spelling of 136494409 in words is "one hundred thirty-six million, four hundred ninety-four thousand, four hundred nine".