820126331 has 4 divisors (see below), whose sum is σ = 820200000. Its totient is φ = 820052664.

The previous prime is 820126289. The next prime is 820126337. The reversal of 820126331 is 133621028.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820126331 is a prime.

It is a super-2 number, since 2×820126331² = 1345214397599043122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 820126331.

It is not an unprimeable number, because it can be changed into a prime (820126337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16331 + ... + 43668.

It is an arithmetic number, because the mean of its divisors is an integer number (205050000).

Almost surely, 2^820126331 is an apocalyptic number.

820126331 is a deficient number, since it is larger than the sum of its proper divisors (73669).

820126331 is a wasteful number, since it uses less digits than its factorization.

820126331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73668.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 820126331 is about 28637.8478765427. The cubic root of 820126331 is about 936.0382267456.

Adding to 820126331 its reverse (133621028), we get a palindrome (953747359).

The spelling of 820126331 in words is "eight hundred twenty million, one hundred twenty-six thousand, three hundred thirty-one".