1620222125 has 8 divisors (see below), whose sum is σ = 2022037368. Its totient is φ = 1296177600.

The previous prime is 1620222113. The next prime is 1620222173. The reversal of 1620222125 is 5212220261.

It can be written as a sum of positive squares in 4 ways, for example, as 12773476 + 1607448649 = 3574^2 + 40093^2 .

It is not a de Polignac number, because 1620222125 - 2⁶ = 1620222061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1620222125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6480764 + ... + 6481013.

It is an arithmetic number, because the mean of its divisors is an integer number (252754671).

Almost surely, 2^1620222125 is an apocalyptic number.

It is an amenable number.

1620222125 is a deficient number, since it is larger than the sum of its proper divisors (401815243).

1620222125 is an equidigital number, since it uses as much as digits as its factorization.

1620222125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12961792 (or 12961782 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1620222125 is about 40251.9828704127. The cubic root of 1620222125 is about 1174.5139682910.

Adding to 1620222125 its reverse (5212220261), we get a palindrome (6832442386).

The spelling of 1620222125 in words is "one billion, six hundred twenty million, two hundred twenty-two thousand, one hundred twenty-five".