129352649 has 4 divisors (see below), whose sum is σ = 130030080. Its totient is φ = 128675220.

The previous prime is 129352637. The next prime is 129352661. The reversal of 129352649 is 946253921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (129352637) and next prime (129352661).

It is a cyclic number.

It is not a de Polignac number, because 129352649 - 2⁴ = 129352633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129352669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338429 + ... + 338810.

It is an arithmetic number, because the mean of its divisors is an integer number (32507520).

Almost surely, 2^129352649 is an apocalyptic number.

It is an amenable number.

129352649 is a deficient number, since it is larger than the sum of its proper divisors (677431).

129352649 is an equidigital number, since it uses as much as digits as its factorization.

129352649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677430.

The product of its digits is 116640, while the sum is 41.

The square root of 129352649 is about 11373.3306027742. The cubic root of 129352649 is about 505.7374436583.

The spelling of 129352649 in words is "one hundred twenty-nine million, three hundred fifty-two thousand, six hundred forty-nine".