196995581 has 2 divisors, whose sum is σ = 196995582. Its totient is φ = 196995580.

The previous prime is 196995563. The next prime is 196995587. The reversal of 196995581 is 185599691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194156356 + 2839225 = 13934^2 + 1685^2 .

It is a cyclic number.

It is not a de Polignac number, because 196995581 - 2⁶ = 196995517 is a prime.

It is a super-2 number, since 2×196995581² = 77614517867055122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196995587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98497790 + 98497791.

It is an arithmetic number, because the mean of its divisors is an integer number (98497791).

Almost surely, 2^196995581 is an apocalyptic number.

It is an amenable number.

196995581 is a deficient number, since it is larger than the sum of its proper divisors (1).

196995581 is an equidigital number, since it uses as much as digits as its factorization.

196995581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 874800, while the sum is 53.

The square root of 196995581 is about 14035.5114263784. The cubic root of 196995581 is about 581.8604360226.

The spelling of 196995581 in words is "one hundred ninety-six million, nine hundred ninety-five thousand, five hundred eighty-one".