1620512101 has 6 divisors (see below), whose sum is σ = 1754755890. Its totient is φ = 1495857168.

The previous prime is 1620512099. The next prime is 1620512119. The reversal of 1620512101 is 1012150261.

It can be written as a sum of positive squares in 3 ways, for example, as 52272900 + 1568239201 = 7230^2 + 39601^2 .

It is not a de Polignac number, because 1620512101 - 2¹ = 1620512099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620512161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4794246 + ... + 4794583.

It is an arithmetic number, because the mean of its divisors is an integer number (292459315).

Almost surely, 2^1620512101 is an apocalyptic number.

It is an amenable number.

1620512101 is a deficient number, since it is larger than the sum of its proper divisors (134243789).

1620512101 is an equidigital number, since it uses as much as digits as its factorization.

1620512101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9588855 (or 9588842 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 1620512101 is about 40255.5847181481. The cubic root of 1620512101 is about 1174.5840328706.

Adding to 1620512101 its reverse (1012150261), we get a palindrome (2632662362).

The spelling of 1620512101 in words is "one billion, six hundred twenty million, five hundred twelve thousand, one hundred one".