129445961 has 8 divisors (see below), whose sum is σ = 131718240. Its totient is φ = 127192032.

The previous prime is 129445949. The next prime is 129445963. The reversal of 129445961 is 169544921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129445961 - 2²² = 125251657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129445963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10046 + ... + 18968.

It is an arithmetic number, because the mean of its divisors is an integer number (16464780).

Almost surely, 2^129445961 is an apocalyptic number.

It is an amenable number.

129445961 is a deficient number, since it is larger than the sum of its proper divisors (2272279).

129445961 is an equidigital number, since it uses as much as digits as its factorization.

129445961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9175.

The product of its digits is 77760, while the sum is 41.

The square root of 129445961 is about 11377.4320916453. The cubic root of 129445961 is about 505.8590235143.

The spelling of 129445961 in words is "one hundred twenty-nine million, four hundred forty-five thousand, nine hundred sixty-one".