128931274997 has 16 divisors (see below), whose sum is σ = 152128929792. Its totient is φ = 106929549360.

The previous prime is 128931274991. The next prime is 128931275047. The reversal of 128931274997 is 799472139821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 128931274997 - 2²⁰ = 128930226421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128931274991) 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, 1325108 + ... + 1419074.

It is an arithmetic number, because the mean of its divisors is an integer number (9508058112).

Almost surely, 2^128931274997 is an apocalyptic number.

It is an amenable number.

128931274997 is a deficient number, since it is larger than the sum of its proper divisors (23197654795).

128931274997 is an equidigital number, since it uses as much as digits as its factorization.

128931274997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100328.

The product of its digits is 13716864, while the sum is 62.

The spelling of 128931274997 in words is "one hundred twenty-eight billion, nine hundred thirty-one million, two hundred seventy-four thousand, nine hundred ninety-seven".