128464621 has 2 divisors, whose sum is σ = 128464622. Its totient is φ = 128464620.

The previous prime is 128464619. The next prime is 128464667. The reversal of 128464621 is 126464821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107433225 + 21031396 = 10365^2 + 4586^2 .

It is a cyclic number.

It is not a de Polignac number, because 128464621 - 2¹ = 128464619 is a prime.

Together with 128464619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128464601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64232310 + 64232311.

It is an arithmetic number, because the mean of its divisors is an integer number (64232311).

Almost surely, 2^128464621 is an apocalyptic number.

It is an amenable number.

128464621 is a deficient number, since it is larger than the sum of its proper divisors (1).

128464621 is an equidigital number, since it uses as much as digits as its factorization.

128464621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 34.

The square root of 128464621 is about 11334.2234405362. The cubic root of 128464621 is about 504.5774604946.

The spelling of 128464621 in words is "one hundred twenty-eight million, four hundred sixty-four thousand, six hundred twenty-one".