30550621 has 2 divisors, whose sum is σ = 30550622. Its totient is φ = 30550620.

The previous prime is 30550579. The next prime is 30550669. The reversal of 30550621 is 12605503.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23863225 + 6687396 = 4885^2 + 2586^2 .

It is an emirp because it is prime and its reverse (12605503) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30550621 - 2¹³ = 30542429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30550592 and 30550601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30551621) 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, 15275310 + 15275311.

It is an arithmetic number, because the mean of its divisors is an integer number (15275311).

Almost surely, 2^30550621 is an apocalyptic number.

It is an amenable number.

30550621 is a deficient number, since it is larger than the sum of its proper divisors (1).

30550621 is an equidigital number, since it uses as much as digits as its factorization.

30550621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 30550621 is about 5527.2616185594. The cubic root of 30550621 is about 312.6127456647.

The spelling of 30550621 in words is "thirty million, five hundred fifty thousand, six hundred twenty-one".