221046191 has 2 divisors, whose sum is σ = 221046192. Its totient is φ = 221046190.

The previous prime is 221046179. The next prime is 221046239. The reversal of 221046191 is 191640122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221046191 is a prime.

It is a super-2 number, since 2×221046191² = 97722837111216962, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221046191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221046131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110523095 + 110523096.

It is an arithmetic number, because the mean of its divisors is an integer number (110523096).

Almost surely, 2^221046191 is an apocalyptic number.

221046191 is a deficient number, since it is larger than the sum of its proper divisors (1).

221046191 is an equidigital number, since it uses as much as digits as its factorization.

221046191 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 26.

The square root of 221046191 is about 14867.6222376007. The cubic root of 221046191 is about 604.6364785645.

The spelling of 221046191 in words is "two hundred twenty-one million, forty-six thousand, one hundred ninety-one".