196564681 has 4 divisors (see below), whose sum is σ = 197158864. Its totient is φ = 195970500.

The previous prime is 196564679. The next prime is 196564699. The reversal of 196564681 is 186465691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 186465691 = 6911 ⋅26981.

It is a cyclic number.

It is not a de Polignac number, because 196564681 - 2¹ = 196564679 is a prime.

It is a super-2 number, since 2×196564681² = 77275347633263522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196564981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296595 + ... + 297256.

It is an arithmetic number, because the mean of its divisors is an integer number (49289716).

Almost surely, 2^196564681 is an apocalyptic number.

It is an amenable number.

196564681 is a deficient number, since it is larger than the sum of its proper divisors (594183).

196564681 is an equidigital number, since it uses as much as digits as its factorization.

196564681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594182.

The product of its digits is 311040, while the sum is 46.

The square root of 196564681 is about 14020.1526739191. The cubic root of 196564681 is about 581.4358804892.

The spelling of 196564681 in words is "one hundred ninety-six million, five hundred sixty-four thousand, six hundred eighty-one".