129907819 has 2 divisors, whose sum is σ = 129907820. Its totient is φ = 129907818.

The previous prime is 129907801. The next prime is 129907861. The reversal of 129907819 is 918709921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129907819 - 2⁷ = 129907691 is a prime.

It is a super-2 number, since 2×129907819² = 33752082874673522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129907879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64953909 + 64953910.

It is an arithmetic number, because the mean of its divisors is an integer number (64953910).

Almost surely, 2^129907819 is an apocalyptic number.

129907819 is a deficient number, since it is larger than the sum of its proper divisors (1).

129907819 is an equidigital number, since it uses as much as digits as its factorization.

129907819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 46.

The square root of 129907819 is about 11397.7111298716. The cubic root of 129907819 is about 506.4599376403.

The spelling of 129907819 in words is "one hundred twenty-nine million, nine hundred seven thousand, eight hundred nineteen".