196381561 has 4 divisors (see below), whose sum is σ = 197466724. Its totient is φ = 195296400.

The previous prime is 196381543. The next prime is 196381571. The reversal of 196381561 is 165183691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165183691 = 503 ⋅328397.

It can be written as a sum of positive squares in 2 ways, for example, as 64705936 + 131675625 = 8044^2 + 11475^2 .

It is a cyclic number.

It is not a de Polignac number, because 196381561 - 2¹⁷ = 196250489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196381571) 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, 542310 + ... + 542671.

It is an arithmetic number, because the mean of its divisors is an integer number (49366681).

Almost surely, 2^196381561 is an apocalyptic number.

It is an amenable number.

196381561 is a deficient number, since it is larger than the sum of its proper divisors (1085163).

196381561 is a wasteful number, since it uses less digits than its factorization.

196381561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085162.

The product of its digits is 38880, while the sum is 40.

The square root of 196381561 is about 14013.6205528764. The cubic root of 196381561 is about 581.2552688311.

The spelling of 196381561 in words is "one hundred ninety-six million, three hundred eighty-one thousand, five hundred sixty-one".