125721508 has 24 divisors (see below), whose sum is σ = 245599200. Its totient is φ = 55816320.

The previous prime is 125721481. The next prime is 125721509. The reversal of 125721508 is 805127521.

It is a self number, because there is not a number n which added to its sum of digits gives 125721508.

It is not an unprimeable number, because it can be changed into a prime (125721509) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 31333 + ... + 35116.

It is an arithmetic number, because the mean of its divisors is an integer number (10233300).

Almost surely, 2^125721508 is an apocalyptic number.

It is an amenable number.

125721508 is a deficient number, since it is larger than the sum of its proper divisors (119877692).

125721508 is a wasteful number, since it uses less digits than its factorization.

125721508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66507 (or 66505 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 125721508 is about 11212.5602785448. The cubic root of 125721508 is about 500.9601656503.

The spelling of 125721508 in words is "one hundred twenty-five million, seven hundred twenty-one thousand, five hundred eight".