221074649 has 2 divisors, whose sum is σ = 221074650. Its totient is φ = 221074648.

The previous prime is 221074631. The next prime is 221074663. The reversal of 221074649 is 946470122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175377049 + 45697600 = 13243^2 + 6760^2 .

It is a cyclic number.

It is not a de Polignac number, because 221074649 - 2⁸ = 221074393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221074549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110537324 + 110537325.

It is an arithmetic number, because the mean of its divisors is an integer number (110537325).

Almost surely, 2^221074649 is an apocalyptic number.

It is an amenable number.

221074649 is a deficient number, since it is larger than the sum of its proper divisors (1).

221074649 is an equidigital number, since it uses as much as digits as its factorization.

221074649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 221074649 is about 14868.5792529078. The cubic root of 221074649 is about 604.6624248859.

The spelling of 221074649 in words is "two hundred twenty-one million, seventy-four thousand, six hundred forty-nine".