820446091 has 4 divisors (see below), whose sum is σ = 821138472. Its totient is φ = 819753712.

The previous prime is 820446083. The next prime is 820446101. The reversal of 820446091 is 190644028.

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 820446091 - 2³ = 820446083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820440091) 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, 344410 + ... + 346783.

It is an arithmetic number, because the mean of its divisors is an integer number (205284618).

Almost surely, 2^820446091 is an apocalyptic number.

820446091 is a deficient number, since it is larger than the sum of its proper divisors (692381).

820446091 is a wasteful number, since it uses less digits than its factorization.

820446091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692380.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 820446091 is about 28643.4301542256. The cubic root of 820446091 is about 936.1598619463.

The spelling of 820446091 in words is "eight hundred twenty million, four hundred forty-six thousand, ninety-one".