121725125 has 8 divisors (see below), whose sum is σ = 151913112. Its totient is φ = 97380000.

The previous prime is 121725101. The next prime is 121725137. The reversal of 121725125 is 521527121.

It can be written as a sum of positive squares in 4 ways, for example, as 19351201 + 102373924 = 4399^2 + 10118^2 .

It is not a de Polignac number, because 121725125 - 2¹⁰ = 121724101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121725094 and 121725103.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 486776 + ... + 487025.

It is an arithmetic number, because the mean of its divisors is an integer number (18989139).

Almost surely, 2^121725125 is an apocalyptic number.

It is an amenable number.

121725125 is a deficient number, since it is larger than the sum of its proper divisors (30187987).

121725125 is an frugal number, since it uses more digits than its factorization.

121725125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973816 (or 973806 counting only the distinct ones).

The product of its digits is 1400, while the sum is 26.

The square root of 121725125 is about 11032.9109939308. The cubic root of 121725125 is about 495.5948024507.

The spelling of 121725125 in words is "one hundred twenty-one million, seven hundred twenty-five thousand, one hundred twenty-five".