1998356351 has 2 divisors, whose sum is σ = 1998356352. Its totient is φ = 1998356350.

The previous prime is 1998356333. The next prime is 1998356411. The reversal of 1998356351 is 1536538991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1998356351 - 2¹⁰ = 1998355327 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1998356351.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998356551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999178175 + 999178176.

It is an arithmetic number, because the mean of its divisors is an integer number (999178176).

Almost surely, 2^1998356351 is an apocalyptic number.

1998356351 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998356351 is an equidigital number, since it uses as much as digits as its factorization.

1998356351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 874800, while the sum is 50.

The square root of 1998356351 is about 44702.9792183921. The cubic root of 1998356351 is about 1259.5758106399.

The spelling of 1998356351 in words is "one billion, nine hundred ninety-eight million, three hundred fifty-six thousand, three hundred fifty-one".