129918969 has 12 divisors (see below), whose sum is σ = 187788900. Its totient is φ = 86553504.

The previous prime is 129918931. The next prime is 129918983. The reversal of 129918969 is 969819921.

It can be written as a sum of positive squares in 2 ways, for example, as 52707600 + 77211369 = 7260^2 + 8787^2 .

It is not a de Polignac number, because 129918969 - 2¹³ = 129910777 is a prime.

It is a super-2 number, since 2×129918969² = 33757877012045922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (129918989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12067 + ... + 20135.

It is an arithmetic number, because the mean of its divisors is an integer number (15649075).

Almost surely, 2^129918969 is an apocalyptic number.

It is an amenable number.

129918969 is a deficient number, since it is larger than the sum of its proper divisors (57869931).

129918969 is a wasteful number, since it uses less digits than its factorization.

129918969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9864 (or 9861 counting only the distinct ones).

The product of its digits is 629856, while the sum is 54.

The square root of 129918969 is about 11398.2002526715. The cubic root of 129918969 is about 506.4744270600.

The spelling of 129918969 in words is "one hundred twenty-nine million, nine hundred eighteen thousand, nine hundred sixty-nine".