128219231 has 16 divisors (see below), whose sum is σ = 150542400. Its totient is φ = 109156320.

The previous prime is 128219191. The next prime is 128219233. The reversal of 128219231 is 132912821.

It is not a de Polignac number, because 128219231 - 2¹⁴ = 128202847 is a prime.

It is a super-2 number, since 2×128219231² = 32880342396462722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128219194 and 128219203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128219233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52661 + ... + 55041.

It is an arithmetic number, because the mean of its divisors is an integer number (9408900).

Almost surely, 2^128219231 is an apocalyptic number.

128219231 is a deficient number, since it is larger than the sum of its proper divisors (22323169).

128219231 is an equidigital number, since it uses as much as digits as its factorization.

128219231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2559 (or 2545 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 128219231 is about 11323.3930868799. The cubic root of 128219231 is about 504.2559785072.

The spelling of 128219231 in words is "one hundred twenty-eight million, two hundred nineteen thousand, two hundred thirty-one".