2820430091 has 4 divisors (see below), whose sum is σ = 2968873800. Its totient is φ = 2671986384.

The previous prime is 2820430087. The next prime is 2820430133. The reversal of 2820430091 is 1900340282.

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 2820430091 - 2² = 2820430087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2820430021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74221826 + ... + 74221863.

It is an arithmetic number, because the mean of its divisors is an integer number (742218450).

Almost surely, 2^2820430091 is an apocalyptic number.

2820430091 is a deficient number, since it is larger than the sum of its proper divisors (148443709).

2820430091 is a wasteful number, since it uses less digits than its factorization.

2820430091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148443708.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 2820430091 is about 53107.7215760571. The cubic root of 2820430091 is about 1412.8794652919.

The spelling of 2820430091 in words is "two billion, eight hundred twenty million, four hundred thirty thousand, ninety-one".