1620222011 has 4 divisors (see below), whose sum is σ = 1620589992. Its totient is φ = 1619854032.

The previous prime is 1620221989. The next prime is 1620222041. The reversal of 1620222011 is 1102220261.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1620222011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620222041) 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, 177305 + ... + 186218.

It is an arithmetic number, because the mean of its divisors is an integer number (405147498).

Almost surely, 2^1620222011 is an apocalyptic number.

1620222011 is a deficient number, since it is larger than the sum of its proper divisors (367981).

1620222011 is an equidigital number, since it uses as much as digits as its factorization.

1620222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367980.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1620222011 is about 40251.9814543334. The cubic root of 1620222011 is about 1174.5139407444.

Adding to 1620222011 its reverse (1102220261), we get a palindrome (2722442272).

The spelling of 1620222011 in words is "one billion, six hundred twenty million, two hundred twenty-two thousand, eleven".