30525821 has 2 divisors, whose sum is σ = 30525822. Its totient is φ = 30525820.

The previous prime is 30525809. The next prime is 30525839. The reversal of 30525821 is 12852503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30525625 + 196 = 5525^2 + 14^2 .

It is an emirp because it is prime and its reverse (12852503) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30525821 - 2²² = 26331517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30525841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15262910 + 15262911.

It is an arithmetic number, because the mean of its divisors is an integer number (15262911).

Almost surely, 2^30525821 is an apocalyptic number.

It is an amenable number.

30525821 is a deficient number, since it is larger than the sum of its proper divisors (1).

30525821 is an equidigital number, since it uses as much as digits as its factorization.

30525821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 30525821 is about 5525.0177375281. The cubic root of 30525821 is about 312.5281331472.

The spelling of 30525821 in words is "thirty million, five hundred twenty-five thousand, eight hundred twenty-one".