2161903825 has 24 divisors (see below), whose sum is σ = 2704514400. Its totient is φ = 1714268160.

The previous prime is 2161903811. The next prime is 2161903829. The reversal of 2161903825 is 5283091612.

It is not a de Polignac number, because 2161903825 - 2¹⁵ = 2161871057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2161903829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1874449 + ... + 1875601.

It is an arithmetic number, because the mean of its divisors is an integer number (112688100).

Almost surely, 2^2161903825 is an apocalyptic number.

2161903825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2161903825 is a deficient number, since it is larger than the sum of its proper divisors (542610575).

2161903825 is a wasteful number, since it uses less digits than its factorization.

2161903825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761 (or 1756 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 2161903825 is about 46496.2775391751. The cubic root of 2161903825 is about 1293.0404864398.

The spelling of 2161903825 in words is "two billion, one hundred sixty-one million, nine hundred three thousand, eight hundred twenty-five".