820073481 has 4 divisors (see below), whose sum is σ = 1093431312. Its totient is φ = 546715652.

The previous prime is 820073479. The next prime is 820073519. The reversal of 820073481 is 184370028.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 820073481 - 2¹ = 820073479 is a prime.

It is a super-2 number, since 2×820073481² = 1345041028478914722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (820073461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136678911 + ... + 136678916.

It is an arithmetic number, because the mean of its divisors is an integer number (273357828).

Almost surely, 2^820073481 is an apocalyptic number.

It is an amenable number.

820073481 is a deficient number, since it is larger than the sum of its proper divisors (273357831).

820073481 is a wasteful number, since it uses less digits than its factorization.

820073481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273357830.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 820073481 is about 28636.9251317246. The cubic root of 820073481 is about 936.0181198096.

The spelling of 820073481 in words is "eight hundred twenty million, seventy-three thousand, four hundred eighty-one".