199221761 has 2 divisors, whose sum is σ = 199221762. Its totient is φ = 199221760.

The previous prime is 199221731. The next prime is 199221823. The reversal of 199221761 is 167122991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155251600 + 43970161 = 12460^2 + 6631^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199221761 is a prime.

It is a super-2 number, since 2×199221761² = 79378620111882242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (199221731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99610880 + 99610881.

It is an arithmetic number, because the mean of its divisors is an integer number (99610881).

Almost surely, 2^199221761 is an apocalyptic number.

It is an amenable number.

199221761 is a deficient number, since it is larger than the sum of its proper divisors (1).

199221761 is an equidigital number, since it uses as much as digits as its factorization.

199221761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 38.

The square root of 199221761 is about 14114.5939013491. The cubic root of 199221761 is about 584.0440334362.

The spelling of 199221761 in words is "one hundred ninety-nine million, two hundred twenty-one thousand, seven hundred sixty-one".