198781147 has 2 divisors, whose sum is σ = 198781148. Its totient is φ = 198781146.

The previous prime is 198781133. The next prime is 198781171. The reversal of 198781147 is 741187891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198781147 - 2²⁷ = 64563419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198781097 and 198781106.

It is not a weakly prime, because it can be changed into another prime (198781547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99390573 + 99390574.

It is an arithmetic number, because the mean of its divisors is an integer number (99390574).

Almost surely, 2^198781147 is an apocalyptic number.

198781147 is a deficient number, since it is larger than the sum of its proper divisors (1).

198781147 is an equidigital number, since it uses as much as digits as its factorization.

198781147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 46.

The square root of 198781147 is about 14098.9768068467. The cubic root of 198781147 is about 583.6131435475.

It can be divided in two parts, 19878 and 1147, that added together give a square (21025 = 145²).

The spelling of 198781147 in words is "one hundred ninety-eight million, seven hundred eighty-one thousand, one hundred forty-seven".