129641819 has 2 divisors, whose sum is σ = 129641820. Its totient is φ = 129641818.

The previous prime is 129641797. The next prime is 129641833. The reversal of 129641819 is 918146921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129641819 - 2¹⁶ = 129576283 is a prime.

It is a super-2 number, since 2×129641819² = 33614002467257522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129641419) 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 as a sum of consecutive naturals, namely, 64820909 + 64820910.

It is an arithmetic number, because the mean of its divisors is an integer number (64820910).

Almost surely, 2^129641819 is an apocalyptic number.

129641819 is a deficient number, since it is larger than the sum of its proper divisors (1).

129641819 is an equidigital number, since it uses as much as digits as its factorization.

129641819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 41.

The square root of 129641819 is about 11386.0361408174. The cubic root of 129641819 is about 506.1140246711.

The spelling of 129641819 in words is "one hundred twenty-nine million, six hundred forty-one thousand, eight hundred nineteen".