998781213 has 16 divisors (see below), whose sum is σ = 1346723840. Its totient is φ = 658382256.

The previous prime is 998781181. The next prime is 998781241. The reversal of 998781213 is 312187899.

It is not a de Polignac number, because 998781213 - 2⁵ = 998781181 is a prime.

It is a super-2 number, since 2×998781213² = 1995127822883502738, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is the 31604-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998781713) by changing a digit.

It is a nontrivial repunit in base 31603.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112698 + ... + 121236.

It is an arithmetic number, because the mean of its divisors is an integer number (84170240).

Almost surely, 2^998781213 is an apocalyptic number.

It is an amenable number.

998781213 is a deficient number, since it is larger than the sum of its proper divisors (347942627).

998781213 is a wasteful number, since it uses less digits than its factorization.

998781213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8976.

The product of its digits is 217728, while the sum is 48.

The square root of 998781213 is about 31603.5000118658. The cubic root of 998781213 is about 999.5935725057.

The spelling of 998781213 in words is "nine hundred ninety-eight million, seven hundred eighty-one thousand, two hundred thirteen".