129391963 has 4 divisors (see below), whose sum is σ = 129859360. Its totient is φ = 128924568.

The previous prime is 129391961. The next prime is 129391973. The reversal of 129391963 is 369193921.

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

It is a cyclic number.

It is not a de Polignac number, because 129391963 - 2¹ = 129391961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129391961) 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, 233283 + ... + 233836.

It is an arithmetic number, because the mean of its divisors is an integer number (32464840).

Almost surely, 2^129391963 is an apocalyptic number.

129391963 is a deficient number, since it is larger than the sum of its proper divisors (467397).

129391963 is an equidigital number, since it uses as much as digits as its factorization.

129391963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467396.

The product of its digits is 78732, while the sum is 43.

The square root of 129391963 is about 11375.0588130348. The cubic root of 129391963 is about 505.7886745326.

The spelling of 129391963 in words is "one hundred twenty-nine million, three hundred ninety-one thousand, nine hundred sixty-three".