128463971 has 4 divisors (see below), whose sum is σ = 129444744. Its totient is φ = 127483200.

The previous prime is 128463961. The next prime is 128463983. The reversal of 128463971 is 179364821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 179364821 = 2137 ⋅83933.

It is a cyclic number.

It is not a de Polignac number, because 128463971 - 2¹⁴ = 128447587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128463931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490190 + ... + 490451.

It is an arithmetic number, because the mean of its divisors is an integer number (32361186).

Almost surely, 2^128463971 is an apocalyptic number.

128463971 is a deficient number, since it is larger than the sum of its proper divisors (980773).

128463971 is an equidigital number, since it uses as much as digits as its factorization.

128463971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980772.

The product of its digits is 72576, while the sum is 41.

The square root of 128463971 is about 11334.1947662814. The cubic root of 128463971 is about 504.5766094797.

The spelling of 128463971 in words is "one hundred twenty-eight million, four hundred sixty-three thousand, nine hundred seventy-one".