128631789601 has 4 divisors (see below), whose sum is σ = 147007759552. Its totient is φ = 110255819652.

The previous prime is 128631789571. The next prime is 128631789607. The reversal of 128631789601 is 106987136821.

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, and also an emirpimes, since its reverse is a distinct semiprime: 106987136821 = 691 ⋅154829431.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128631789601 is a prime.

It is a super-2 number, since 2×128631789601² (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 (128631789607) 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, 9187984965 + ... + 9187984978.

It is an arithmetic number, because the mean of its divisors is an integer number (36751939888).

Almost surely, 2^128631789601 is an apocalyptic number.

It is an amenable number.

128631789601 is a deficient number, since it is larger than the sum of its proper divisors (18375969951).

128631789601 is an equidigital number, since it uses as much as digits as its factorization.

128631789601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18375969950.

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 128631789601 in words is "one hundred twenty-eight billion, six hundred thirty-one million, seven hundred eighty-nine thousand, six hundred one".