129534649 has 2 divisors, whose sum is σ = 129534650. Its totient is φ = 129534648.

The previous prime is 129534637. The next prime is 129534683. The reversal of 129534649 is 946435921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69006249 + 60528400 = 8307^2 + 7780^2 .

It is a cyclic number.

It is not a de Polignac number, because 129534649 - 2¹³ = 129526457 is a prime.

It is not a weakly prime, because it can be changed into another prime (129534749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64767324 + 64767325.

It is an arithmetic number, because the mean of its divisors is an integer number (64767325).

Almost surely, 2^129534649 is an apocalyptic number.

It is an amenable number.

129534649 is a deficient number, since it is larger than the sum of its proper divisors (1).

129534649 is an equidigital number, since it uses as much as digits as its factorization.

129534649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 43.

The square root of 129534649 is about 11381.3289645805. The cubic root of 129534649 is about 505.9745244351.

The spelling of 129534649 in words is "one hundred twenty-nine million, five hundred thirty-four thousand, six hundred forty-nine".