129969941 has 4 divisors (see below), whose sum is σ = 135620832. Its totient is φ = 124319052.

The previous prime is 129969923. The next prime is 129969943. The reversal of 129969941 is 149969921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129969941 - 2¹⁴ = 129953557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129969941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129969943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2825411 + ... + 2825456.

It is an arithmetic number, because the mean of its divisors is an integer number (33905208).

Almost surely, 2^129969941 is an apocalyptic number.

It is an amenable number.

129969941 is a deficient number, since it is larger than the sum of its proper divisors (5650891).

129969941 is an equidigital number, since it uses as much as digits as its factorization.

129969941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5650890.

The product of its digits is 314928, while the sum is 50.

The square root of 129969941 is about 11400.4360004344. The cubic root of 129969941 is about 506.5406545946.

The spelling of 129969941 in words is "one hundred twenty-nine million, nine hundred sixty-nine thousand, nine hundred forty-one".