2181696325 has 12 divisors (see below), whose sum is σ = 2706440740. Its totient is φ = 1744623360.

The previous prime is 2181696317. The next prime is 2181696353. The reversal of 2181696325 is 5236961812.

It can be written as a sum of positive squares in 6 ways, for example, as 314246529 + 1867449796 = 17727^2 + 43214^2 .

It is not a de Polignac number, because 2181696325 - 2³ = 2181696317 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46861 + ... + 80989.

Almost surely, 2^2181696325 is an apocalyptic number.

2181696325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2181696325 is a deficient number, since it is larger than the sum of its proper divisors (524744415).

2181696325 is a wasteful number, since it uses less digits than its factorization.

2181696325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36696 (or 36691 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The square root of 2181696325 is about 46708.6322321688. The cubic root of 2181696325 is about 1296.9744878049.

The spelling of 2181696325 in words is "two billion, one hundred eighty-one million, six hundred ninety-six thousand, three hundred twenty-five".