198461261 has 2 divisors, whose sum is σ = 198461262. Its totient is φ = 198461260.

The previous prime is 198461209. The next prime is 198461299. The reversal of 198461261 is 162164891.

It is an a-pointer prime, because the next prime (198461299) can be obtained adding 198461261 to its sum of digits (38).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195468361 + 2992900 = 13981^2 + 1730^2 .

It is a cyclic number.

It is not a de Polignac number, because 198461261 - 2¹⁴ = 198444877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198464261) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99230630 + 99230631.

It is an arithmetic number, because the mean of its divisors is an integer number (99230631).

Almost surely, 2^198461261 is an apocalyptic number.

It is an amenable number.

198461261 is a deficient number, since it is larger than the sum of its proper divisors (1).

198461261 is an equidigital number, since it uses as much as digits as its factorization.

198461261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 198461261 is about 14087.6279408565. The cubic root of 198461261 is about 583.2999181585.

The spelling of 198461261 in words is "one hundred ninety-eight million, four hundred sixty-one thousand, two hundred sixty-one".