128113531 has 8 divisors (see below), whose sum is σ = 157678304. Its totient is φ = 101364480.

The previous prime is 128113529. The next prime is 128113543. The reversal of 128113531 is 135311821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128113531 - 2¹ = 128113529 is a prime.

It is a super-2 number, since 2×128113531² = 32826153650575922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128113496 and 128113505.

It is not an unprimeable number, because it can be changed into a prime (128113501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 703830 + ... + 704011.

It is an arithmetic number, because the mean of its divisors is an integer number (19709788).

Almost surely, 2^128113531 is an apocalyptic number.

128113531 is a deficient number, since it is larger than the sum of its proper divisors (29564773).

128113531 is a wasteful number, since it uses less digits than its factorization.

128113531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407861.

The product of its digits is 720, while the sum is 25.

The square root of 128113531 is about 11318.7247956649. The cubic root of 128113531 is about 504.1173760280.

The spelling of 128113531 in words is "one hundred twenty-eight million, one hundred thirteen thousand, five hundred thirty-one".