1720723525 has 12 divisors (see below), whose sum is σ = 2141818272. Its totient is φ = 1371339440.

The previous prime is 1720723523. The next prime is 1720723549. The reversal of 1720723525 is 5253270271.

It is not a de Polignac number, because 1720723525 - 2¹ = 1720723523 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 (1720723523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124279 + ... + 137428.

It is an arithmetic number, because the mean of its divisors is an integer number (178484856).

Almost surely, 2^1720723525 is an apocalyptic number.

It is an amenable number.

1720723525 is a deficient number, since it is larger than the sum of its proper divisors (421094747).

1720723525 is a wasteful number, since it uses less digits than its factorization.

1720723525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261980 (or 261975 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 34.

The square root of 1720723525 is about 41481.6046579686. The cubic root of 1720723525 is about 1198.3132609908.

Adding to 1720723525 its reverse (5253270271), we get a palindrome (6973993796).

The spelling of 1720723525 in words is "one billion, seven hundred twenty million, seven hundred twenty-three thousand, five hundred twenty-five".