196771681 has 4 divisors (see below), whose sum is σ = 196843972. Its totient is φ = 196699392.

The previous prime is 196771643. The next prime is 196771691. The reversal of 196771681 is 186177691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47541025 + 149230656 = 6895^2 + 12216^2 .

It is a cyclic number.

It is not a de Polignac number, because 196771681 - 2²³ = 188383073 is a prime.

It is a super-2 number, since 2×196771681² = 77438188887131522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196771691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31896 + ... + 37561.

It is an arithmetic number, because the mean of its divisors is an integer number (49210993).

Almost surely, 2^196771681 is an apocalyptic number.

It is an amenable number.

196771681 is a deficient number, since it is larger than the sum of its proper divisors (72291).

196771681 is an equidigital number, since it uses as much as digits as its factorization.

196771681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72290.

The product of its digits is 127008, while the sum is 46.

The square root of 196771681 is about 14027.5329620001. The cubic root of 196771681 is about 581.6399100270.

The spelling of 196771681 in words is "one hundred ninety-six million, seven hundred seventy-one thousand, six hundred eighty-one".