820280131 has 4 divisors (see below), whose sum is σ = 894851064. Its totient is φ = 745709200.

The previous prime is 820280117. The next prime is 820280137. The reversal of 820280131 is 131082028.

820280131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 820280131 - 2⁹ = 820279619 is a prime.

It is a super-2 number, since 2×820280131² = 1345718986626754322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 820280096 and 820280105.

It is not an unprimeable number, because it can be changed into a prime (820280137) 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, 37285450 + ... + 37285471.

It is an arithmetic number, because the mean of its divisors is an integer number (223712766).

Almost surely, 2^820280131 is an apocalyptic number.

820280131 is a deficient number, since it is larger than the sum of its proper divisors (74570933).

820280131 is a wasteful number, since it uses less digits than its factorization.

820280131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74570932.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 820280131 is about 28640.5330083083. The cubic root of 820280131 is about 936.0967354881.

The spelling of 820280131 in words is "eight hundred twenty million, two hundred eighty thousand, one hundred thirty-one".