128180997 has 12 divisors (see below), whose sum is σ = 211600480. Its totient is φ = 73246248.

The previous prime is 128180963. The next prime is 128181041. The reversal of 128180997 is 799081821.

It is not a de Polignac number, because 128180997 - 2⁶ = 128180933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128180917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1017247 + ... + 1017372.

Almost surely, 2^128180997 is an apocalyptic number.

It is an amenable number.

128180997 is a deficient number, since it is larger than the sum of its proper divisors (83419483).

128180997 is a wasteful number, since it uses less digits than its factorization.

128180997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2034632 (or 2034629 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The square root of 128180997 is about 11321.7046861327. The cubic root of 128180997 is about 504.2058517578.

The spelling of 128180997 in words is "one hundred twenty-eight million, one hundred eighty thousand, nine hundred ninety-seven".