125721716 has 12 divisors (see below), whose sum is σ = 220144260. Its totient is φ = 62823360.

The previous prime is 125721691. The next prime is 125721721. The reversal of 125721716 is 617127521.

It can be written as a sum of positive squares in 2 ways, for example, as 1488400 + 124233316 = 1220^2 + 11146^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1001 + ... + 15888.

It is an arithmetic number, because the mean of its divisors is an integer number (18345355).

Almost surely, 2^125721716 is an apocalyptic number.

It is an amenable number.

125721716 is a deficient number, since it is larger than the sum of its proper divisors (94422544).

125721716 is a wasteful number, since it uses less digits than its factorization.

125721716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18754 (or 18752 counting only the distinct ones).

The product of its digits is 5880, while the sum is 32.

The square root of 125721716 is about 11212.5695538534. The cubic root of 125721716 is about 500.9604419214.

The spelling of 125721716 in words is "one hundred twenty-five million, seven hundred twenty-one thousand, seven hundred sixteen".