30925621 has 2 divisors, whose sum is σ = 30925622. Its totient is φ = 30925620.

The previous prime is 30925619. The next prime is 30925649. The reversal of 30925621 is 12652903.

It is an a-pointer prime, because the next prime (30925649) can be obtained adding 30925621 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30924721 + 900 = 5561^2 + 30^2 .

It is a cyclic number.

It is not a de Polignac number, because 30925621 - 2¹ = 30925619 is a prime.

Together with 30925619, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30925621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30925121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15462810 + 15462811.

It is an arithmetic number, because the mean of its divisors is an integer number (15462811).

Almost surely, 2^30925621 is an apocalyptic number.

It is an amenable number.

30925621 is a deficient number, since it is larger than the sum of its proper divisors (1).

30925621 is an equidigital number, since it uses as much as digits as its factorization.

30925621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 30925621 is about 5561.0809201090. The cubic root of 30925621 is about 313.8866245182.

The spelling of 30925621 in words is "thirty million, nine hundred twenty-five thousand, six hundred twenty-one".