125615506 has 8 divisors (see below), whose sum is σ = 188483724. Its totient is φ = 62787600.

The previous prime is 125615471. The next prime is 125615509. The reversal of 125615506 is 605516521.

It can be written as a sum of positive squares in 2 ways, for example, as 93296281 + 32319225 = 9659^2 + 5685^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (125615509) 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 3 ways as a sum of consecutive naturals, for example, 445 + ... + 15856.

Almost surely, 2^125615506 is an apocalyptic number.

125615506 is a deficient number, since it is larger than the sum of its proper divisors (62868218).

125615506 is a wasteful number, since it uses less digits than its factorization.

125615506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20156.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 125615506 is about 11207.8323506377. The cubic root of 125615506 is about 500.8193313257.

The spelling of 125615506 in words is "one hundred twenty-five million, six hundred fifteen thousand, five hundred six".