221161849 has 2 divisors, whose sum is σ = 221161850. Its totient is φ = 221161848.

The previous prime is 221161819. The next prime is 221161861. The reversal of 221161849 is 948161122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126450025 + 94711824 = 11245^2 + 9732^2 .

It is a cyclic number.

It is not a de Polignac number, because 221161849 - 2⁵ = 221161817 is a prime.

It is not a weakly prime, because it can be changed into another prime (221161819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110580924 + 110580925.

It is an arithmetic number, because the mean of its divisors is an integer number (110580925).

Almost surely, 2^221161849 is an apocalyptic number.

It is an amenable number.

221161849 is a deficient number, since it is larger than the sum of its proper divisors (1).

221161849 is an equidigital number, since it uses as much as digits as its factorization.

221161849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 34.

The square root of 221161849 is about 14871.5113219874. The cubic root of 221161849 is about 604.7419148271.

The spelling of 221161849 in words is "two hundred twenty-one million, one hundred sixty-one thousand, eight hundred forty-nine".