30220891 has 2 divisors, whose sum is σ = 30220892. Its totient is φ = 30220890.

The previous prime is 30220867. The next prime is 30220907. The reversal of 30220891 is 19802203.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30220891 is a prime.

It is not a weakly prime, because it can be changed into another prime (30220591) 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, 15110445 + 15110446.

It is an arithmetic number, because the mean of its divisors is an integer number (15110446).

Almost surely, 2^30220891 is an apocalyptic number.

30220891 is a deficient number, since it is larger than the sum of its proper divisors (1).

30220891 is an equidigital number, since it uses as much as digits as its factorization.

30220891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 30220891 is about 5497.3530903518. The cubic root of 30220891 is about 311.4840083616.

The spelling of 30220891 in words is "thirty million, two hundred twenty thousand, eight hundred ninety-one".