221453161 has 2 divisors, whose sum is σ = 221453162. Its totient is φ = 221453160.

The previous prime is 221453153. The next prime is 221453173. The reversal of 221453161 is 161354122.

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., 214329600 + 7123561 = 14640^2 + 2669^2 .

It is a cyclic number.

It is not a de Polignac number, because 221453161 - 2³ = 221453153 is a prime.

It is not a weakly prime, because it can be changed into another prime (221453191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110726580 + 110726581.

It is an arithmetic number, because the mean of its divisors is an integer number (110726581).

Almost surely, 2^221453161 is an apocalyptic number.

It is an amenable number.

221453161 is a deficient number, since it is larger than the sum of its proper divisors (1).

221453161 is an equidigital number, since it uses as much as digits as its factorization.

221453161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 221453161 is about 14881.3023959598. The cubic root of 221453161 is about 605.0073181730.

The spelling of 221453161 in words is "two hundred twenty-one million, four hundred fifty-three thousand, one hundred sixty-one".