1725155561 has 2 divisors, whose sum is σ = 1725155562. Its totient is φ = 1725155560.

The previous prime is 1725155513. The next prime is 1725155587. The reversal of 1725155561 is 1655515271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1687566400 + 37589161 = 41080^2 + 6131^2 .

It is an emirp because it is prime and its reverse (1655515271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1725155561 - 2²⁶ = 1658046697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1725155501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 862577780 + 862577781.

It is an arithmetic number, because the mean of its divisors is an integer number (862577781).

Almost surely, 2^1725155561 is an apocalyptic number.

It is an amenable number.

1725155561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1725155561 is an equidigital number, since it uses as much as digits as its factorization.

1725155561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52500, while the sum is 38.

The square root of 1725155561 is about 41534.9920067405. The cubic root of 1725155561 is about 1199.3412034351.

The spelling of 1725155561 in words is "one billion, seven hundred twenty-five million, one hundred fifty-five thousand, five hundred sixty-one".