1998169507 has 2 divisors, whose sum is σ = 1998169508. Its totient is φ = 1998169506.

The previous prime is 1998169501. The next prime is 1998169559. The reversal of 1998169507 is 7059618991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1998169507 - 2²⁷ = 1863951779 is a prime.

It is not a weakly prime, because it can be changed into another prime (1998169501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999084753 + 999084754.

It is an arithmetic number, because the mean of its divisors is an integer number (999084754).

Almost surely, 2^1998169507 is an apocalyptic number.

1998169507 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998169507 is an equidigital number, since it uses as much as digits as its factorization.

1998169507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 55.

The square root of 1998169507 is about 44700.8893311979. The cubic root of 1998169507 is about 1259.5365531242.

The spelling of 1998169507 in words is "one billion, nine hundred ninety-eight million, one hundred sixty-nine thousand, five hundred seven".