128474821 has 2 divisors, whose sum is σ = 128474822. Its totient is φ = 128474820.

The previous prime is 128474791. The next prime is 128474837.

It is a happy number.

128474821 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119049921 + 9424900 = 10911^2 + 3070^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 128474821 - 2²⁵ = 94920389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128474861) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64237410 + 64237411.

It is an arithmetic number, because the mean of its divisors is an integer number (64237411).

Almost surely, 2^128474821 is an apocalyptic number.

It is an amenable number.

128474821 is a deficient number, since it is larger than the sum of its proper divisors (1).

128474821 is an equidigital number, since it uses as much as digits as its factorization.

128474821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28672, while the sum is 37.

The square root of 128474821 is about 11334.6733962651. The cubic root of 128474821 is about 504.5908145056.

The spelling of 128474821 in words is "one hundred twenty-eight million, four hundred seventy-four thousand, eight hundred twenty-one".