1721125025 has 6 divisors (see below), whose sum is σ = 2134195062. Its totient is φ = 1376900000.

The previous prime is 1721125001. The next prime is 1721125027. The reversal of 1721125025 is 5205211271.

It can be written as a sum of positive squares in 3 ways, for example, as 134536801 + 1586588224 = 11599^2 + 39832^2 .

It is not a de Polignac number, because 1721125025 - 2¹⁰ = 1721124001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1721124985 and 1721125003.

It is not an unprimeable number, because it can be changed into a prime (1721125027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34422476 + ... + 34422525.

It is an arithmetic number, because the mean of its divisors is an integer number (355699177).

Almost surely, 2^1721125025 is an apocalyptic number.

It is an amenable number.

1721125025 is a deficient number, since it is larger than the sum of its proper divisors (413070037).

1721125025 is an equidigital number, since it uses as much as digits as its factorization.

1721125025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68845011 (or 68845006 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 1721125025 is about 41486.4438702572. The cubic root of 1721125025 is about 1198.4064553849.

Adding to 1721125025 its reverse (5205211271), we get a palindrome (6926336296).

The spelling of 1721125025 in words is "one billion, seven hundred twenty-one million, one hundred twenty-five thousand, twenty-five".