197722969 has 2 divisors, whose sum is σ = 197722970. Its totient is φ = 197722968.

The previous prime is 197722933. The next prime is 197722979. The reversal of 197722969 is 969227791.

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., 134281744 + 63441225 = 11588^2 + 7965^2 .

It is a cyclic number.

It is not a de Polignac number, because 197722969 - 2⁹ = 197722457 is a prime.

It is a super-2 number, since 2×197722969² = 78188744940349922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (197722919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98861484 + 98861485.

It is an arithmetic number, because the mean of its divisors is an integer number (98861485).

Almost surely, 2^197722969 is an apocalyptic number.

It is an amenable number.

197722969 is a deficient number, since it is larger than the sum of its proper divisors (1).

197722969 is an equidigital number, since it uses as much as digits as its factorization.

197722969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 857304, while the sum is 52.

The square root of 197722969 is about 14061.3999658640. The cubic root of 197722969 is about 582.5757116984.

The spelling of 197722969 in words is "one hundred ninety-seven million, seven hundred twenty-two thousand, nine hundred sixty-nine".