820198511 has 8 divisors (see below), whose sum is σ = 897330000. Its totient is φ = 743495040.

The previous prime is 820198501. The next prime is 820198543. The reversal of 820198511 is 115891028.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820198511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820198501) 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 in 7 ways as a sum of consecutive naturals, for example, 102986 + ... + 110663.

It is an arithmetic number, because the mean of its divisors is an integer number (112166250).

Almost surely, 2^820198511 is an apocalyptic number.

820198511 is a deficient number, since it is larger than the sum of its proper divisors (77131489).

820198511 is a wasteful number, since it uses less digits than its factorization.

820198511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214009.

The product of its (nonzero) digits is 5760, while the sum is 35.

The square root of 820198511 is about 28639.1080692119. The cubic root of 820198511 is about 936.0656864408.

The spelling of 820198511 in words is "eight hundred twenty million, one hundred ninety-eight thousand, five hundred eleven".