129555983 has 4 divisors (see below), whose sum is σ = 130744680. Its totient is φ = 128367288.

The previous prime is 129555977. The next prime is 129555989. The reversal of 129555983 is 389555921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 389555921 = 7649 ⋅50929.

It is an interprime number because it is at equal distance from previous prime (129555977) and next prime (129555989).

It is a cyclic number.

It is not a de Polignac number, because 129555983 - 2⁴ = 129555967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129555989) 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 in 3 ways as a sum of consecutive naturals, for example, 594185 + ... + 594402.

It is an arithmetic number, because the mean of its divisors is an integer number (32686170).

Almost surely, 2^129555983 is an apocalyptic number.

129555983 is a deficient number, since it is larger than the sum of its proper divisors (1188697).

129555983 is a wasteful number, since it uses less digits than its factorization.

129555983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188696.

The product of its digits is 486000, while the sum is 47.

The square root of 129555983 is about 11382.2661627639. The cubic root of 129555983 is about 506.0023004473.

The spelling of 129555983 in words is "one hundred twenty-nine million, five hundred fifty-five thousand, nine hundred eighty-three".