197898791 has 2 divisors, whose sum is σ = 197898792. Its totient is φ = 197898790.

The previous prime is 197898731. The next prime is 197898817.

197898791 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 197898791 - 2¹⁴ = 197882407 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197898791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197898731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98949395 + 98949396.

It is an arithmetic number, because the mean of its divisors is an integer number (98949396).

Almost surely, 2^197898791 is an apocalyptic number.

197898791 is a deficient number, since it is larger than the sum of its proper divisors (1).

197898791 is an equidigital number, since it uses as much as digits as its factorization.

197898791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 59.

The square root of 197898791 is about 14067.6505145671. The cubic root of 197898791 is about 582.7483425954.

The spelling of 197898791 in words is "one hundred ninety-seven million, eight hundred ninety-eight thousand, seven hundred ninety-one".