129489949 has 4 divisors (see below), whose sum is σ = 129789436. Its totient is φ = 129190464.

The previous prime is 129489947. The next prime is 129489953. The reversal of 129489949 is 949984921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 949984921 = 5023 ⋅189127.

It can be written as a sum of positive squares in 2 ways, for example, as 47858724 + 81631225 = 6918^2 + 9035^2 .

It is a cyclic number.

It is not a de Polignac number, because 129489949 - 2¹ = 129489947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129489949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129489947) 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, 149094 + ... + 149959.

It is an arithmetic number, because the mean of its divisors is an integer number (32447359).

Almost surely, 2^129489949 is an apocalyptic number.

It is an amenable number.

129489949 is a deficient number, since it is larger than the sum of its proper divisors (299487).

129489949 is an equidigital number, since it uses as much as digits as its factorization.

129489949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299486.

The product of its digits is 1679616, while the sum is 55.

The square root of 129489949 is about 11379.3650525853. The cubic root of 129489949 is about 505.9163169375.

The spelling of 129489949 in words is "one hundred twenty-nine million, four hundred eighty-nine thousand, nine hundred forty-nine".