130406521 has 12 divisors (see below), whose sum is σ = 150602752. Its totient is φ = 110607336.

The previous prime is 130406503. The next prime is 130406561. The reversal of 130406521 is 125604031.

It is not a de Polignac number, because 130406521 - 2⁵ = 130406489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 130406492 and 130406501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130406561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 340296 + ... + 340678.

Almost surely, 2^130406521 is an apocalyptic number.

It is an amenable number.

130406521 is a deficient number, since it is larger than the sum of its proper divisors (20196231).

130406521 is an frugal number, since it uses more digits than its factorization.

130406521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900 (or 517 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 130406521 is about 11419.5674611607. The cubic root of 130406521 is about 507.1071916540.

The spelling of 130406521 in words is "one hundred thirty million, four hundred six thousand, five hundred twenty-one".