197429681 has 2 divisors, whose sum is σ = 197429682. Its totient is φ = 197429680.

The previous prime is 197429671. The next prime is 197429699. The reversal of 197429681 is 186924791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191573281 + 5856400 = 13841^2 + 2420^2 .

It is an emirp because it is prime and its reverse (186924791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197429681 - 2¹⁴ = 197413297 is a prime.

It is a super-2 number, since 2×197429681² = 77956957879523522, 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 (197429621) 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, 98714840 + 98714841.

It is an arithmetic number, because the mean of its divisors is an integer number (98714841).

Almost surely, 2^197429681 is an apocalyptic number.

It is an amenable number.

197429681 is a deficient number, since it is larger than the sum of its proper divisors (1).

197429681 is an equidigital number, since it uses as much as digits as its factorization.

197429681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 197429681 is about 14050.9672620784. The cubic root of 197429681 is about 582.2875188841.

The spelling of 197429681 in words is "one hundred ninety-seven million, four hundred twenty-nine thousand, six hundred eighty-one".