820581051 has 8 divisors (see below), whose sum is σ = 1141678080. Its totient is φ = 523269032.

The previous prime is 820580963. The next prime is 820581059. The reversal of 820581051 is 150185028.

820581051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 820581051 - 2⁷ = 820580923 is a prime.

It is a super-2 number, since 2×820581051² = 1346706522520529202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (820581059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5946171 + ... + 5946308.

It is an arithmetic number, because the mean of its divisors is an integer number (142709760).

Almost surely, 2^820581051 is an apocalyptic number.

820581051 is a deficient number, since it is larger than the sum of its proper divisors (321097029).

820581051 is a wasteful number, since it uses less digits than its factorization.

820581051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11892505.

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 820581051 is about 28645.7859204456. The cubic root of 820581051 is about 936.2111906114.

The spelling of 820581051 in words is "eight hundred twenty million, five hundred eighty-one thousand, fifty-one".