998213851 has 2 divisors, whose sum is σ = 998213852. Its totient is φ = 998213850.

The previous prime is 998213833. The next prime is 998213873. The reversal of 998213851 is 158312899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998213851 - 2¹⁵ = 998181083 is a prime.

It is not a weakly prime, because it can be changed into another prime (998213831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499106925 + 499106926.

It is an arithmetic number, because the mean of its divisors is an integer number (499106926).

Almost surely, 2^998213851 is an apocalyptic number.

998213851 is the 14130-th centered decagonal number.

998213851 is a deficient number, since it is larger than the sum of its proper divisors (1).

998213851 is an equidigital number, since it uses as much as digits as its factorization.

998213851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 46.

The square root of 998213851 is about 31594.5224841269. The cubic root of 998213851 is about 999.4042621669.

The spelling of 998213851 in words is "nine hundred ninety-eight million, two hundred thirteen thousand, eight hundred fifty-one".