121725 has 18 divisors (see below), whose sum is σ = 218426. Its totient is φ = 64800.

The previous prime is 121721. The next prime is 121727. The reversal of 121725 is 527121.

It can be written as a sum of positive squares in 3 ways, for example, as 4761 + 116964 = 69^2 + 342^2 .

It is not a de Polignac number, because 121725 - 2² = 121721 is a prime.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121698 and 121707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 46 + ... + 495.

2¹²¹⁷²⁵ is an apocalyptic number.

121725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121725 is a deficient number, since it is larger than the sum of its proper divisors (96701).

121725 is a wasteful number, since it uses less digits than its factorization.

121725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557 (or 549 counting only the distinct ones).

The product of its digits is 140, while the sum is 18.

The square root of 121725 is about 348.8911004884. The cubic root of 121725 is about 49.5594632808.

Adding to 121725 its reverse (527121), we get a palindrome (648846).

The spelling of 121725 in words is "one hundred twenty-one thousand, seven hundred twenty-five".