129830749 has 2 divisors, whose sum is σ = 129830750. Its totient is φ = 129830748.

The previous prime is 129830713. The next prime is 129830773. The reversal of 129830749 is 947038921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116251524 + 13579225 = 10782^2 + 3685^2 .

It is a cyclic number.

It is not a de Polignac number, because 129830749 - 2⁹ = 129830237 is a prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129830849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64915374 + 64915375.

It is an arithmetic number, because the mean of its divisors is an integer number (64915375).

Almost surely, 2^129830749 is an apocalyptic number.

It is an amenable number.

129830749 is a deficient number, since it is larger than the sum of its proper divisors (1).

129830749 is an equidigital number, since it uses as much as digits as its factorization.

129830749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 129830749 is about 11394.3296862957. The cubic root of 129830749 is about 506.3597625335.

The spelling of 129830749 in words is "one hundred twenty-nine million, eight hundred thirty thousand, seven hundred forty-nine".