2109615925 has 6 divisors (see below), whose sum is σ = 2615923778. Its totient is φ = 1687692720.

The previous prime is 2109615919. The next prime is 2109615943. The reversal of 2109615925 is 5295169012.

It can be written as a sum of positive squares in 3 ways, for example, as 142884 + 2109473041 = 378^2 + 45929^2 .

It is not a de Polignac number, because 2109615925 - 2³ = 2109615917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42192294 + ... + 42192343.

Almost surely, 2^2109615925 is an apocalyptic number.

2109615925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2109615925 is a deficient number, since it is larger than the sum of its proper divisors (506307853).

2109615925 is an equidigital number, since it uses as much as digits as its factorization.

2109615925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84384647 (or 84384642 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 2109615925 is about 45930.5554614790. Note that the first 3 decimals coincide. The cubic root of 2109615925 is about 1282.5307849285.

The spelling of 2109615925 in words is "two billion, one hundred nine million, six hundred fifteen thousand, nine hundred twenty-five".