198921461 has 2 divisors, whose sum is σ = 198921462. Its totient is φ = 198921460.

The previous prime is 198921449. The next prime is 198921467. The reversal of 198921461 is 164129891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148084561 + 50836900 = 12169^2 + 7130^2 .

It is a cyclic number.

It is not a de Polignac number, because 198921461 - 2¹⁰ = 198920437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198921467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99460730 + 99460731.

It is an arithmetic number, because the mean of its divisors is an integer number (99460731).

Almost surely, 2^198921461 is an apocalyptic number.

It is an amenable number.

198921461 is a deficient number, since it is larger than the sum of its proper divisors (1).

198921461 is an equidigital number, since it uses as much as digits as its factorization.

198921461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 41.

The square root of 198921461 is about 14103.9519639000. The cubic root of 198921461 is about 583.7504299312.

The spelling of 198921461 in words is "one hundred ninety-eight million, nine hundred twenty-one thousand, four hundred sixty-one".