1720540525 has 12 divisors (see below), whose sum is σ = 2327422464. Its totient is φ = 1251302000.

The previous prime is 1720540499. The next prime is 1720540529. The reversal of 1720540525 is 5250450271.

It is not a de Polignac number, because 1720540525 - 2¹⁹ = 1720016237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720540529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3127981 + ... + 3128530.

It is an arithmetic number, because the mean of its divisors is an integer number (193951872).

Almost surely, 2^1720540525 is an apocalyptic number.

It is an amenable number.

1720540525 is a deficient number, since it is larger than the sum of its proper divisors (606881939).

1720540525 is a wasteful number, since it uses less digits than its factorization.

1720540525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6256532 (or 6256527 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 31.

The square root of 1720540525 is about 41479.3988022970. The cubic root of 1720540525 is about 1198.2707790352.

Adding to 1720540525 its reverse (5250450271), we get a palindrome (6970990796).

It can be divided in two parts, 1720 and 540525, that added together give a palindrome (542245).

The spelling of 1720540525 in words is "one billion, seven hundred twenty million, five hundred forty thousand, five hundred twenty-five".