198904619 has 2 divisors, whose sum is σ = 198904620. Its totient is φ = 198904618.

The previous prime is 198904613. The next prime is 198904663. The reversal of 198904619 is 916409891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198904619 - 2¹² = 198900523 is a prime.

It is a super-2 number, since 2×198904619² = 79126094919070322, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (198904613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99452309 + 99452310.

It is an arithmetic number, because the mean of its divisors is an integer number (99452310).

Almost surely, 2^198904619 is an apocalyptic number.

198904619 is a deficient number, since it is larger than the sum of its proper divisors (1).

198904619 is an equidigital number, since it uses as much as digits as its factorization.

198904619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 198904619 is about 14103.3548845656. The cubic root of 198904619 is about 583.7339547485.

The spelling of 198904619 in words is "one hundred ninety-eight million, nine hundred four thousand, six hundred nineteen".