125408506 has 4 divisors (see below), whose sum is σ = 188112762. Its totient is φ = 62704252.

The previous prime is 125408477. The next prime is 125408509. The reversal of 125408506 is 605804521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 122877225 + 2531281 = 11085^2 + 1591^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (125408509) 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 as a sum of consecutive naturals, namely, 31352125 + ... + 31352128.

Almost surely, 2^125408506 is an apocalyptic number.

125408506 is a deficient number, since it is larger than the sum of its proper divisors (62704256).

125408506 is an equidigital number, since it uses as much as digits as its factorization.

125408506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62704255.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 125408506 is about 11198.5939295967. The cubic root of 125408506 is about 500.5440824006.

The spelling of 125408506 in words is "one hundred twenty-five million, four hundred eight thousand, five hundred six".