129948181 has 16 divisors (see below), whose sum is σ = 146704320. Its totient is φ = 114065280.

The previous prime is 129948157. The next prime is 129948227. The reversal of 129948181 is 181849921.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 129948181 - 2¹¹ = 129946133 is a prime.

It is a super-2 number, since 2×129948181² = 33773059490417522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129948131) 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 15 ways as a sum of consecutive naturals, for example, 55425 + ... + 57721.

It is an arithmetic number, because the mean of its divisors is an integer number (9169020).

Almost surely, 2^129948181 is an apocalyptic number.

129948181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

129948181 is a deficient number, since it is larger than the sum of its proper divisors (16756139).

129948181 is a wasteful number, since it uses less digits than its factorization.

129948181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484.

The product of its digits is 41472, while the sum is 43.

The square root of 129948181 is about 11399.4816110207. The cubic root of 129948181 is about 506.5123841095.

The spelling of 129948181 in words is "one hundred twenty-nine million, nine hundred forty-eight thousand, one hundred eighty-one".