128631162241 has 4 divisors (see below), whose sum is σ = 129570075972. Its totient is φ = 127692248512.

The previous prime is 128631162223. The next prime is 128631162277. The reversal of 128631162241 is 142261136821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65175537025 + 63455625216 = 255295^2 + 251904^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128631162241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128631162241.

It is not an unprimeable number, because it can be changed into a prime (128631160241) 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, 469456660 + ... + 469456933.

It is an arithmetic number, because the mean of its divisors is an integer number (32392518993).

Almost surely, 2^128631162241 is an apocalyptic number.

It is an amenable number.

128631162241 is a deficient number, since it is larger than the sum of its proper divisors (938913731).

128631162241 is an equidigital number, since it uses as much as digits as its factorization.

128631162241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938913730.

The product of its digits is 27648, while the sum is 37.

The spelling of 128631162241 in words is "one hundred twenty-eight billion, six hundred thirty-one million, one hundred sixty-two thousand, two hundred forty-one".