129999963 has 4 divisors (see below), whose sum is σ = 173333288. Its totient is φ = 86666640.

The previous prime is 129999931. The next prime is 129999973. The reversal of 129999963 is 369999921.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 129999963 - 2⁵ = 129999931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129999913) 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, 21666658 + ... + 21666663.

It is an arithmetic number, because the mean of its divisors is an integer number (43333322).

Almost surely, 2^129999963 is an apocalyptic number.

129999963 is a deficient number, since it is larger than the sum of its proper divisors (43333325).

129999963 is an equidigital number, since it uses as much as digits as its factorization.

129999963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43333324.

The product of its digits is 2125764, while the sum is 57.

The square root of 129999963 is about 11401.7526284339. The cubic root of 129999963 is about 506.5796538500.

The spelling of 129999963 in words is "one hundred twenty-nine million, nine hundred ninety-nine thousand, nine hundred sixty-three".