129694549 has 4 divisors (see below), whose sum is σ = 129754764. Its totient is φ = 129634336.

The previous prime is 129694541. The next prime is 129694553. The reversal of 129694549 is 945496921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71064900 + 58629649 = 8430^2 + 7657^2 .

It is a cyclic number.

It is not a de Polignac number, because 129694549 - 2³ = 129694541 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129694541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26752 + ... + 31225.

It is an arithmetic number, because the mean of its divisors is an integer number (32438691).

Almost surely, 2^129694549 is an apocalyptic number.

It is an amenable number.

129694549 is a deficient number, since it is larger than the sum of its proper divisors (60215).

129694549 is an equidigital number, since it uses as much as digits as its factorization.

129694549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60214.

The product of its digits is 699840, while the sum is 49.

The square root of 129694549 is about 11388.3514610325. The cubic root of 129694549 is about 506.1826336413.

The spelling of 129694549 in words is "one hundred twenty-nine million, six hundred ninety-four thousand, five hundred forty-nine".