30193621 has 2 divisors, whose sum is σ = 30193622. Its totient is φ = 30193620.

The previous prime is 30193609. The next prime is 30193661. The reversal of 30193621 is 12639103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27973521 + 2220100 = 5289^2 + 1490^2 .

It is a cyclic number.

It is not a de Polignac number, because 30193621 - 2¹³ = 30185429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30193601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15096810 + 15096811.

It is an arithmetic number, because the mean of its divisors is an integer number (15096811).

Almost surely, 2^30193621 is an apocalyptic number.

It is an amenable number.

30193621 is a deficient number, since it is larger than the sum of its proper divisors (1).

30193621 is an equidigital number, since it uses as much as digits as its factorization.

30193621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 30193621 is about 5494.8722460126. The cubic root of 30193621 is about 311.3902903536.

The spelling of 30193621 in words is "thirty million, one hundred ninety-three thousand, six hundred twenty-one".