30996521 has 2 divisors, whose sum is σ = 30996522. Its totient is φ = 30996520.

The previous prime is 30996517. The next prime is 30996523. The reversal of 30996521 is 12569903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16289296 + 14707225 = 4036^2 + 3835^2 .

It is a cyclic number.

It is not a de Polignac number, because 30996521 - 2² = 30996517 is a prime.

Together with 30996523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30996523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15498260 + 15498261.

It is an arithmetic number, because the mean of its divisors is an integer number (15498261).

Almost surely, 2^30996521 is an apocalyptic number.

It is an amenable number.

30996521 is a deficient number, since it is larger than the sum of its proper divisors (1).

30996521 is an equidigital number, since it uses as much as digits as its factorization.

30996521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 30996521 is about 5567.4519306412. The cubic root of 30996521 is about 314.1263133336.

The spelling of 30996521 in words is "thirty million, nine hundred ninety-six thousand, five hundred twenty-one".