197964919 has 2 divisors, whose sum is σ = 197964920. Its totient is φ = 197964918.

The previous prime is 197964917. The next prime is 197964929. The reversal of 197964919 is 919469791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197964919 - 2¹ = 197964917 is a prime.

It is a super-2 number, since 2×197964919² = 78380218309353122, which contains 22 as substring.

Together with 197964917, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 197964919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197964913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98982459 + 98982460.

It is an arithmetic number, because the mean of its divisors is an integer number (98982460).

Almost surely, 2^197964919 is an apocalyptic number.

197964919 is a deficient number, since it is larger than the sum of its proper divisors (1).

197964919 is an equidigital number, since it uses as much as digits as its factorization.

197964919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 55.

The square root of 197964919 is about 14070.0006751954. Note that the first 3 decimals coincide. The cubic root of 197964919 is about 582.8132439367.

The spelling of 197964919 in words is "one hundred ninety-seven million, nine hundred sixty-four thousand, nine hundred nineteen".