128254813 has 4 divisors (see below), whose sum is σ = 128304540. Its totient is φ = 128205088.

The previous prime is 128254793. The next prime is 128254829. The reversal of 128254813 is 318452821.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 98366724 + 29888089 = 9918^2 + 5467^2 .

It is a cyclic number.

It is not a de Polignac number, because 128254813 - 2¹³ = 128246621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128258813) 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, 20770 + ... + 26227.

It is an arithmetic number, because the mean of its divisors is an integer number (32076135).

Almost surely, 2^128254813 is an apocalyptic number.

It is an amenable number.

128254813 is a deficient number, since it is larger than the sum of its proper divisors (49727).

128254813 is an equidigital number, since it uses as much as digits as its factorization.

128254813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49726.

The product of its digits is 15360, while the sum is 34.

The square root of 128254813 is about 11324.9641500536. The cubic root of 128254813 is about 504.3026193961.

The spelling of 128254813 in words is "one hundred twenty-eight million, two hundred fifty-four thousand, eight hundred thirteen".