128891540281 has 4 divisors (see below), whose sum is σ = 147304617472. Its totient is φ = 110478463092.

The previous prime is 128891540279. The next prime is 128891540341. The reversal of 128891540281 is 182045198821.

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.

It is a cyclic number.

It is not a de Polignac number, because 128891540281 - 2¹ = 128891540279 is a prime.

It is a super-2 number, since 2×128891540281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128891541281) 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, 9206538585 + ... + 9206538598.

It is an arithmetic number, because the mean of its divisors is an integer number (36826154368).

Almost surely, 2^128891540281 is an apocalyptic number.

It is an amenable number.

128891540281 is a deficient number, since it is larger than the sum of its proper divisors (18413077191).

128891540281 is an equidigital number, since it uses as much as digits as its factorization.

128891540281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18413077190.

The product of its (nonzero) digits is 368640, while the sum is 49.

The spelling of 128891540281 in words is "one hundred twenty-eight billion, eight hundred ninety-one million, five hundred forty thousand, two hundred eighty-one".