30680521 has 9 divisors (see below), whose sum is σ = 31942183. Its totient is φ = 29467480.

The previous prime is 30680501. The next prime is 30680527. The reversal of 30680521 is 12508603.

It is a happy number.

The square root of 30680521 is 5539.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 16088121 + 14592400 = 4011^2 + 3820^2 .

It is a de Polignac number, because none of the positive numbers 2^k-30680521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30680527) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 160536 + ... + 160726.

Almost surely, 2^30680521 is an apocalyptic number.

30680521 is the 5539-th square number.

30680521 is the 2770-th centered octagonal number.

It is an amenable number.

30680521 is a deficient number, since it is larger than the sum of its proper divisors (1261662).

30680521 is an frugal number, since it uses more digits than its factorization.

30680521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The cubic root of 30680521 is about 313.0551914026.

Multiplying 30680521 by its sum of digits (25), we get a square (767013025 = 27695²).

The spelling of 30680521 in words is "thirty million, six hundred eighty thousand, five hundred twenty-one".