16148221 has 2 divisors, whose sum is σ = 16148222. Its totient is φ = 16148220.

The previous prime is 16148207. The next prime is 16148267. The reversal of 16148221 is 12284161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16080100 + 68121 = 4010^2 + 261^2 .

It is a cyclic number.

It is not a de Polignac number, because 16148221 - 2⁹ = 16147709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16148281) 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, 8074110 + 8074111.

It is an arithmetic number, because the mean of its divisors is an integer number (8074111).

Almost surely, 2^16148221 is an apocalyptic number.

It is an amenable number.

16148221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16148221 is an equidigital number, since it uses as much as digits as its factorization.

16148221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 25.

The square root of 16148221 is about 4018.4849134966. The cubic root of 16148221 is about 252.7599310008.

The spelling of 16148221 in words is "sixteen million, one hundred forty-eight thousand, two hundred twenty-one".