128849213 has 4 divisors (see below), whose sum is σ = 128877120. Its totient is φ = 128821308.

The previous prime is 128849191. The next prime is 128849219. The reversal of 128849213 is 312948821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 312948821 = 401 ⋅780421.

It is a cyclic number.

It is not a de Polignac number, because 128849213 - 2¹² = 128845117 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 (128849219) 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, 5195 + ... + 16872.

It is an arithmetic number, because the mean of its divisors is an integer number (32219280).

Almost surely, 2^128849213 is an apocalyptic number.

It is an amenable number.

128849213 is a deficient number, since it is larger than the sum of its proper divisors (27907).

128849213 is an equidigital number, since it uses as much as digits as its factorization.

128849213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27906.

The product of its digits is 27648, while the sum is 38.

The square root of 128849213 is about 11351.1767231420. The cubic root of 128849213 is about 505.0804864689.

The spelling of 128849213 in words is "one hundred twenty-eight million, eight hundred forty-nine thousand, two hundred thirteen".