129243369 has 4 divisors (see below), whose sum is σ = 172324496. Its totient is φ = 86162244.

The previous prime is 129243353. The next prime is 129243391. The reversal of 129243369 is 963342921.

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 not a de Polignac number, because 129243369 - 2⁴ = 129243353 is a prime.

It is a super-2 number, since 2×129243369² = 33407696860940322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129243319) 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, 21540559 + ... + 21540564.

It is an arithmetic number, because the mean of its divisors is an integer number (43081124).

Almost surely, 2^129243369 is an apocalyptic number.

It is an amenable number.

129243369 is a deficient number, since it is larger than the sum of its proper divisors (43081127).

129243369 is an equidigital number, since it uses as much as digits as its factorization.

129243369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43081126.

The product of its digits is 69984, while the sum is 39.

The square root of 129243369 is about 11368.5253661150. The cubic root of 129243369 is about 505.5949841129.

The spelling of 129243369 in words is "one hundred twenty-nine million, two hundred forty-three thousand, three hundred sixty-nine".