129472181 has 2 divisors, whose sum is σ = 129472182. Its totient is φ = 129472180.

The previous prime is 129472177. The next prime is 129472193. The reversal of 129472181 is 181274921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129185956 + 286225 = 11366^2 + 535^2 .

It is an emirp because it is prime and its reverse (181274921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129472181 - 2² = 129472177 is a prime.

It is a super-2 number, since 2×129472181² = 33526091305793522, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129472111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64736090 + 64736091.

It is an arithmetic number, because the mean of its divisors is an integer number (64736091).

Almost surely, 2^129472181 is an apocalyptic number.

It is an amenable number.

129472181 is a deficient number, since it is larger than the sum of its proper divisors (1).

129472181 is an equidigital number, since it uses as much as digits as its factorization.

129472181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 35.

The square root of 129472181 is about 11378.5843144040. The cubic root of 129472181 is about 505.8931760622.

The spelling of 129472181 in words is "one hundred twenty-nine million, four hundred seventy-two thousand, one hundred eighty-one".