197122819 has 2 divisors, whose sum is σ = 197122820. Its totient is φ = 197122818.

The previous prime is 197122787. The next prime is 197122829. The reversal of 197122819 is 918221791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197122819 - 2⁵ = 197122787 is a prime.

It is a super-2 number, since 2×197122819² = 77714811541013522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (197122829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98561409 + 98561410.

It is an arithmetic number, because the mean of its divisors is an integer number (98561410).

Almost surely, 2^197122819 is an apocalyptic number.

197122819 is a deficient number, since it is larger than the sum of its proper divisors (1).

197122819 is an equidigital number, since it uses as much as digits as its factorization.

197122819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 40.

The square root of 197122819 is about 14040.0434116138. The cubic root of 197122819 is about 581.9856821897.

The spelling of 197122819 in words is "one hundred ninety-seven million, one hundred twenty-two thousand, eight hundred nineteen".