196505691 has 8 divisors (see below), whose sum is σ = 262080000. Its totient is φ = 130967592.

The previous prime is 196505671. The next prime is 196505693.

196505691 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 196505691 - 2²² = 192311387 is a prime.

It is a super-2 number, since 2×196505691² = 77228973190774962, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (196505693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8446 + ... + 21548.

It is an arithmetic number, because the mean of its divisors is an integer number (32760000).

Almost surely, 2^196505691 is an apocalyptic number.

196505691 is a deficient number, since it is larger than the sum of its proper divisors (65574309).

196505691 is a wasteful number, since it uses less digits than its factorization.

196505691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18105.

The product of its (nonzero) digits is 72900, while the sum is 42.

The square root of 196505691 is about 14018.0487586540. The cubic root of 196505691 is about 581.3777107745.

The spelling of 196505691 in words is "one hundred ninety-six million, five hundred five thousand, six hundred ninety-one".