121718725 has 12 divisors (see below), whose sum is σ = 159810084. Its totient is φ = 91646720.

The previous prime is 121718719. The next prime is 121718749. The reversal of 121718725 is 527817121.

It can be written as a sum of positive squares in 6 ways, for example, as 1640961 + 120077764 = 1281^2 + 10958^2 .

It is not a de Polignac number, because 121718725 - 2⁹ = 121718213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 142774 + ... + 143623.

It is an arithmetic number, because the mean of its divisors is an integer number (13317507).

Almost surely, 2^121718725 is an apocalyptic number.

It is an amenable number.

121718725 is a deficient number, since it is larger than the sum of its proper divisors (38091359).

121718725 is a wasteful number, since it uses less digits than its factorization.

121718725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286424 (or 286419 counting only the distinct ones).

The product of its digits is 7840, while the sum is 34.

The square root of 121718725 is about 11032.6209488045. The cubic root of 121718725 is about 495.5861165904.

The spelling of 121718725 in words is "one hundred twenty-one million, seven hundred eighteen thousand, seven hundred twenty-five".