197128945281 has 16 divisors (see below), whose sum is σ = 263714834240. Its totient is φ = 130981294080.

The previous prime is 197128945267. The next prime is 197128945291. The reversal of 197128945281 is 182549821791.

It is a happy number.

It is not a de Polignac number, because 197128945281 - 2¹⁸ = 197128683137 is a prime.

It is a super-2 number, since 2×197128945281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (197128945201) 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, 12613290 + ... + 12628908.

It is an arithmetic number, because the mean of its divisors is an integer number (16482177140).

Almost surely, 2^197128945281 is an apocalyptic number.

It is an amenable number.

197128945281 is a deficient number, since it is larger than the sum of its proper divisors (66585888959).

197128945281 is a wasteful number, since it uses less digits than its factorization.

197128945281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29376.

The product of its digits is 2903040, while the sum is 57.

The spelling of 197128945281 in words is "one hundred ninety-seven billion, one hundred twenty-eight million, nine hundred forty-five thousand, two hundred eighty-one".