2106901801 has 9 divisors (see below), whose sum is σ = 2126778661. Its totient is φ = 2087210272.

The previous prime is 2106901793. The next prime is 2106901807. The reversal of 2106901801 is 1081096012.

It is a happy number.

The square root of 2106901801 is 45901.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 214651801 + 1892250000 = 14651^2 + 43500^2 .

It is not a de Polignac number, because 2106901801 - 2³ = 2106901793 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 2106901801.

It is not an unprimeable number, because it can be changed into a prime (2106901807) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9042381 + ... + 9042613.

Almost surely, 2^2106901801 is an apocalyptic number.

2106901801 is the 45901-st square number.

2106901801 is the 22951-st centered octagonal number.

It is an amenable number.

2106901801 is a deficient number, since it is larger than the sum of its proper divisors (19876860).

2106901801 is an frugal number, since it uses more digits than its factorization.

2106901801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 430 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 28.

The cubic root of 2106901801 is about 1281.9805360398.

Adding to 2106901801 its reverse (1081096012), we get a palindrome (3187997813).

The spelling of 2106901801 in words is "two billion, one hundred six million, nine hundred one thousand, eight hundred one".