1725132809 has 2 divisors, whose sum is σ = 1725132810. Its totient is φ = 1725132808.

The previous prime is 1725132767. The next prime is 1725132841. The reversal of 1725132809 is 9082315271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1580460025 + 144672784 = 39755^2 + 12028^2 .

It is an emirp because it is prime and its reverse (9082315271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1725132809 - 2²⁰ = 1724084233 is a prime.

It is not a weakly prime, because it can be changed into another prime (1725132869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 862566404 + 862566405.

It is an arithmetic number, because the mean of its divisors is an integer number (862566405).

Almost surely, 2^1725132809 is an apocalyptic number.

It is an amenable number.

1725132809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1725132809 is an equidigital number, since it uses as much as digits as its factorization.

1725132809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 1725132809 is about 41534.7181162940. The cubic root of 1725132809 is about 1199.3359309577.

The spelling of 1725132809 in words is "one billion, seven hundred twenty-five million, one hundred thirty-two thousand, eight hundred nine".