129186481 has 2 divisors, whose sum is σ = 129186482. Its totient is φ = 129186480.

The previous prime is 129186467. The next prime is 129186487. The reversal of 129186481 is 184681921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104346225 + 24840256 = 10215^2 + 4984^2 .

It is an emirp because it is prime and its reverse (184681921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129186481 - 2¹³ = 129178289 is a prime.

It is a super-2 number, since 2×129186481² = 33378293746326722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129186487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64593240 + 64593241.

It is an arithmetic number, because the mean of its divisors is an integer number (64593241).

Almost surely, 2^129186481 is an apocalyptic number.

It is an amenable number.

129186481 is a deficient number, since it is larger than the sum of its proper divisors (1).

129186481 is an equidigital number, since it uses as much as digits as its factorization.

129186481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 40.

The square root of 129186481 is about 11366.0230951727. The cubic root of 129186481 is about 505.5207920189.

The spelling of 129186481 in words is "one hundred twenty-nine million, one hundred eighty-six thousand, four hundred eighty-one".