129023019 has 6 divisors (see below), whose sum is σ = 186366596. Its totient is φ = 86015340.

The previous prime is 129023017. The next prime is 129023057. The reversal of 129023019 is 910320921.

It is not a de Polignac number, because 129023019 - 2¹ = 129023017 is a prime.

It is a super-2 number, since 2×129023019² = 33293878863748722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129022983 and 129023001.

It is not an unprimeable number, because it can be changed into a prime (129023017) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7167937 + ... + 7167954.

Almost surely, 2^129023019 is an apocalyptic number.

129023019 is a deficient number, since it is larger than the sum of its proper divisors (57343577).

129023019 is a wasteful number, since it uses less digits than its factorization.

129023019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14335897 (or 14335894 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 129023019 is about 11358.8300013690. The cubic root of 129023019 is about 505.3074871486.

The spelling of 129023019 in words is "one hundred twenty-nine million, twenty-three thousand, nineteen".