130128973 has 4 divisors (see below), whose sum is σ = 140138908. Its totient is φ = 120119040.

The previous prime is 130128961. The next prime is 130128989. The reversal of 130128973 is 379821031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 379821031 = 83 ⋅4576157.

It can be written as a sum of positive squares in 2 ways, for example, as 54125449 + 76003524 = 7357^2 + 8718^2 .

It is a cyclic number.

It is not a de Polignac number, because 130128973 - 2⁹ = 130128461 is a prime.

It is a super-2 number, since 2×130128973² = 33867099228069458, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130128923) 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, 5004948 + ... + 5004973.

It is an arithmetic number, because the mean of its divisors is an integer number (35034727).

Almost surely, 2^130128973 is an apocalyptic number.

130128973 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

130128973 is a deficient number, since it is larger than the sum of its proper divisors (10009935).

130128973 is a wasteful number, since it uses less digits than its factorization.

130128973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10009934.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 130128973 is about 11407.4086890932. The cubic root of 130128973 is about 506.7471724472.

The spelling of 130128973 in words is "one hundred thirty million, one hundred twenty-eight thousand, nine hundred seventy-three".