129822949 has 2 divisors, whose sum is σ = 129822950. Its totient is φ = 129822948.

The previous prime is 129822943. The next prime is 129822997. The reversal of 129822949 is 949228921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129800449 + 22500 = 11393^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 129822949 - 2⁹ = 129822437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129822899 and 129822908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129822943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64911474 + 64911475.

It is an arithmetic number, because the mean of its divisors is an integer number (64911475).

Almost surely, 2^129822949 is an apocalyptic number.

It is an amenable number.

129822949 is a deficient number, since it is larger than the sum of its proper divisors (1).

129822949 is an equidigital number, since it uses as much as digits as its factorization.

129822949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The square root of 129822949 is about 11393.9874056451. The cubic root of 129822949 is about 506.3496219331.

It can be divided in two parts, 12982 and 2949, that added together give a triangular number (15931 = T₁₇₈).

The spelling of 129822949 in words is "one hundred twenty-nine million, eight hundred twenty-two thousand, nine hundred forty-nine".