30519821 has 2 divisors, whose sum is σ = 30519822. Its totient is φ = 30519820.

The previous prime is 30519799. The next prime is 30519859. The reversal of 30519821 is 12891503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16933225 + 13586596 = 4115^2 + 3686^2 .

It is a cyclic number.

It is not a de Polignac number, because 30519821 - 2¹⁴ = 30503437 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 (30519721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15259910 + 15259911.

It is an arithmetic number, because the mean of its divisors is an integer number (15259911).

Almost surely, 2^30519821 is an apocalyptic number.

It is an amenable number.

30519821 is a deficient number, since it is larger than the sum of its proper divisors (1).

30519821 is an equidigital number, since it uses as much as digits as its factorization.

30519821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 30519821 is about 5524.4747261618. The cubic root of 30519821 is about 312.5076554925.

The spelling of 30519821 in words is "thirty million, five hundred nineteen thousand, eight hundred twenty-one".