1721506925 has 24 divisors (see below), whose sum is σ = 2181277800. Its totient is φ = 1347379200.

The previous prime is 1721506909. The next prime is 1721506949. The reversal of 1721506925 is 5296051271.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 1302199396 + 419307529 = 36086^2 + 20477^2 .

It is not a de Polignac number, because 1721506925 - 2⁴ = 1721506909 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 291401 + ... + 297249.

It is an arithmetic number, because the mean of its divisors is an integer number (90886575).

Almost surely, 2^1721506925 is an apocalyptic number.

It is an amenable number.

1721506925 is a deficient number, since it is larger than the sum of its proper divisors (459770875).

1721506925 is a wasteful number, since it uses less digits than its factorization.

1721506925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6113 (or 6108 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 1721506925 is about 41491.0463232732. The cubic root of 1721506925 is about 1198.4950868656.

The spelling of 1721506925 in words is "one billion, seven hundred twenty-one million, five hundred six thousand, nine hundred twenty-five".