196908561 has 12 divisors (see below), whose sum is σ = 292111092. Its totient is φ = 127724256.

The previous prime is 196908553. The next prime is 196908581. The reversal of 196908561 is 165809691.

196908561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 172108161 + 24800400 = 13119^2 + 4980^2 .

It is not a de Polignac number, because 196908561 - 2³ = 196908553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (196908581) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 295326 + ... + 295991.

It is an arithmetic number, because the mean of its divisors is an integer number (24342591).

Almost surely, 2^196908561 is an apocalyptic number.

It is an amenable number.

196908561 is a deficient number, since it is larger than the sum of its proper divisors (95202531).

196908561 is a wasteful number, since it uses less digits than its factorization.

196908561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591360 (or 591357 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 196908561 is about 14032.4110900444. The cubic root of 196908561 is about 581.7747472096.

The spelling of 196908561 in words is "one hundred ninety-six million, nine hundred eight thousand, five hundred sixty-one".