197790771 has 4 divisors (see below), whose sum is σ = 263721032. Its totient is φ = 131860512.

The previous prime is 197790751. The next prime is 197790781. The reversal of 197790771 is 177097791.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 197790771 - 2⁵ = 197790739 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 197790771.

It is not an unprimeable number, because it can be changed into a prime (197790721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32965126 + ... + 32965131.

It is an arithmetic number, because the mean of its divisors is an integer number (65930258).

Almost surely, 2^197790771 is an apocalyptic number.

197790771 is a deficient number, since it is larger than the sum of its proper divisors (65930261).

197790771 is an equidigital number, since it uses as much as digits as its factorization.

197790771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65930260.

The product of its (nonzero) digits is 194481, while the sum is 48.

The square root of 197790771 is about 14063.8106855859. The cubic root of 197790771 is about 582.6422952361.

The spelling of 197790771 in words is "one hundred ninety-seven million, seven hundred ninety thousand, seven hundred seventy-one".