198456977 has 2 divisors, whose sum is σ = 198456978. Its totient is φ = 198456976.

The previous prime is 198456913. The next prime is 198456989. The reversal of 198456977 is 779654891.

198456977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164070481 + 34386496 = 12809^2 + 5864^2 .

It is an emirp because it is prime and its reverse (779654891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198456977 - 2⁶ = 198456913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198456877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99228488 + 99228489.

It is an arithmetic number, because the mean of its divisors is an integer number (99228489).

Almost surely, 2^198456977 is an apocalyptic number.

It is an amenable number.

198456977 is a deficient number, since it is larger than the sum of its proper divisors (1).

198456977 is an equidigital number, since it uses as much as digits as its factorization.

198456977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 56.

The square root of 198456977 is about 14087.4758917274. The cubic root of 198456977 is about 583.2957210760.

The spelling of 198456977 in words is "one hundred ninety-eight million, four hundred fifty-six thousand, nine hundred seventy-seven".