221146649 has 2 divisors, whose sum is σ = 221146650. Its totient is φ = 221146648.

The previous prime is 221146619. The next prime is 221146657. The reversal of 221146649 is 946641122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206439424 + 14707225 = 14368^2 + 3835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221146649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221146619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110573324 + 110573325.

It is an arithmetic number, because the mean of its divisors is an integer number (110573325).

Almost surely, 2^221146649 is an apocalyptic number.

It is an amenable number.

221146649 is a deficient number, since it is larger than the sum of its proper divisors (1).

221146649 is an equidigital number, since it uses as much as digits as its factorization.

221146649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 221146649 is about 14871.0002689799. Note that the first 3 decimals coincide. The cubic root of 221146649 is about 604.7280602861.

The spelling of 221146649 in words is "two hundred twenty-one million, one hundred forty-six thousand, six hundred forty-nine".