196817261 has 4 divisors (see below), whose sum is σ = 201617724. Its totient is φ = 192016800.

The previous prime is 196817251. The next prime is 196817263. The reversal of 196817261 is 162718691.

196817261 = T₃₀₇₈ + T₃₀₇₉ + ... + T₃₁₁₈.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162718691 = 1237 ⋅131543.

It can be written as a sum of positive squares in 2 ways, for example, as 25050025 + 171767236 = 5005^2 + 13106^2 .

It is a cyclic number.

It is not a de Polignac number, because 196817261 - 2²² = 192622957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 4800421 = 196817261 / (1 + 9 + 6 + 8 + 1 + 7 + 2 + 6 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196817263) 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, 2400170 + ... + 2400251.

It is an arithmetic number, because the mean of its divisors is an integer number (50404431).

Almost surely, 2^196817261 is an apocalyptic number.

It is an amenable number.

196817261 is a deficient number, since it is larger than the sum of its proper divisors (4800463).

196817261 is an equidigital number, since it uses as much as digits as its factorization.

196817261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4800462.

The product of its digits is 36288, while the sum is 41.

The square root of 196817261 is about 14029.1575299446. The cubic root of 196817261 is about 581.6848167267.

The spelling of 196817261 in words is "one hundred ninety-six million, eight hundred seventeen thousand, two hundred sixty-one".