129361869 has 24 divisors (see below), whose sum is σ = 229978112. Its totient is φ = 68234400.

The previous prime is 129361849. The next prime is 129361873. The reversal of 129361869 is 968163921.

It is a happy number.

129361869 is a `hidden beast` number, since 1 + 29 + 3 + 618 + 6 + 9 = 666.

It is not a de Polignac number, because 129361869 - 2⁸ = 129361613 is a prime.

It is a super-2 number, since 2×129361869² = 33468986302346322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129361829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78157 + ... + 79794.

Almost surely, 2^129361869 is an apocalyptic number.

It is an amenable number.

129361869 is a deficient number, since it is larger than the sum of its proper divisors (100616243).

129361869 is a wasteful number, since it uses less digits than its factorization.

129361869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157977 (or 157974 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 129361869 is about 11373.7359297638. The cubic root of 129361869 is about 505.7494593598.

The spelling of 129361869 in words is "one hundred twenty-nine million, three hundred sixty-one thousand, eight hundred sixty-nine".