129048949 has 4 divisors (see below), whose sum is σ = 130682560. Its totient is φ = 127415340.

The previous prime is 129048947. The next prime is 129048973. The reversal of 129048949 is 949840921.

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, and also an emirpimes, since its reverse is a distinct semiprime: 949840921 = 20959 ⋅45319.

It is a cyclic number.

It is not a de Polignac number, because 129048949 - 2¹ = 129048947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129048899 and 129048908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129048947) 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, 816687 + ... + 816844.

It is an arithmetic number, because the mean of its divisors is an integer number (32670640).

Almost surely, 2^129048949 is an apocalyptic number.

It is an amenable number.

129048949 is a deficient number, since it is larger than the sum of its proper divisors (1633611).

129048949 is an equidigital number, since it uses as much as digits as its factorization.

129048949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633610.

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

The square root of 129048949 is about 11359.9713467949. The cubic root of 129048949 is about 505.3413357481.

The spelling of 129048949 in words is "one hundred twenty-nine million, forty-eight thousand, nine hundred forty-nine".