2106051985 has 8 divisors (see below), whose sum is σ = 2529230760. Its totient is φ = 1683529344.

The previous prime is 2106051977. The next prime is 2106051989. The reversal of 2106051985 is 5891506012.

It can be written as a sum of positive squares in 4 ways, for example, as 419471361 + 1686580624 = 20481^2 + 41068^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2106051985 - 2³ = 2106051977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2106051989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156942 + ... + 169831.

It is an arithmetic number, because the mean of its divisors is an integer number (316153845).

Almost surely, 2^2106051985 is an apocalyptic number.

It is an amenable number.

2106051985 is a deficient number, since it is larger than the sum of its proper divisors (423178775).

2106051985 is a wasteful number, since it uses less digits than its factorization.

2106051985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328067.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 2106051985 is about 45891.7420131335. The cubic root of 2106051985 is about 1281.8081511539.

Adding to 2106051985 its reverse (5891506012), we get a palindrome (7997557997).

The spelling of 2106051985 in words is "two billion, one hundred six million, fifty-one thousand, nine hundred eighty-five".