1998019481 has 2 divisors, whose sum is σ = 1998019482. Its totient is φ = 1998019480.

The previous prime is 1998019451. The next prime is 1998019511. The reversal of 1998019481 is 1849108991.

It is a balanced prime because it is at equal distance from previous prime (1998019451) and next prime (1998019511).

It can be written as a sum of positive squares in only one way, i.e., 1329331600 + 668687881 = 36460^2 + 25859^2 .

It is a cyclic number.

It is not a de Polignac number, because 1998019481 - 2²⁶ = 1930910617 is a prime.

It is a super-2 number, since 2×1998019481² = 7984163692911018722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1998019411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999009740 + 999009741.

It is an arithmetic number, because the mean of its divisors is an integer number (999009741).

Almost surely, 2^1998019481 is an apocalyptic number.

It is an amenable number.

1998019481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998019481 is an equidigital number, since it uses as much as digits as its factorization.

1998019481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 50.

The square root of 1998019481 is about 44699.2111899080. The cubic root of 1998019481 is about 1259.5050296123.

The spelling of 1998019481 in words is "one billion, nine hundred ninety-eight million, nineteen thousand, four hundred eighty-one".