129214145 has 4 divisors (see below), whose sum is σ = 155056980. Its totient is φ = 103371312.

The previous prime is 129214133. The next prime is 129214147. The reversal of 129214145 is 541412921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541412921 = 7 ⋅77344703.

It can be written as a sum of positive squares in 2 ways, for example, as 59474944 + 69739201 = 7712^2 + 8351^2 .

It is a cyclic number.

It is not a de Polignac number, because 129214145 - 2⁶ = 129214081 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (129214147) 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, 12921410 + ... + 12921419.

It is an arithmetic number, because the mean of its divisors is an integer number (38764245).

Almost surely, 2^129214145 is an apocalyptic number.

It is an amenable number.

129214145 is a deficient number, since it is larger than the sum of its proper divisors (25842835).

129214145 is an equidigital number, since it uses as much as digits as its factorization.

129214145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25842834.

The product of its digits is 2880, while the sum is 29.

The square root of 129214145 is about 11367.2399904286. The cubic root of 129214145 is about 505.5568735268.

The spelling of 129214145 in words is "one hundred twenty-nine million, two hundred fourteen thousand, one hundred forty-five".