30194921 has 2 divisors, whose sum is σ = 30194922. Its totient is φ = 30194920.

The previous prime is 30194911. The next prime is 30194953. The reversal of 30194921 is 12949103.

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., 28504921 + 1690000 = 5339^2 + 1300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30194921 is a prime.

It is not a weakly prime, because it can be changed into another prime (30194911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15097460 + 15097461.

It is an arithmetic number, because the mean of its divisors is an integer number (15097461).

Almost surely, 2^30194921 is an apocalyptic number.

It is an amenable number.

30194921 is a deficient number, since it is larger than the sum of its proper divisors (1).

30194921 is an equidigital number, since it uses as much as digits as its factorization.

30194921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 30194921 is about 5494.9905368435. The cubic root of 30194921 is about 311.3947593060.

The spelling of 30194921 in words is "thirty million, one hundred ninety-four thousand, nine hundred twenty-one".