125581903 has 4 divisors (see below), whose sum is σ = 125691048. Its totient is φ = 125472760.

The previous prime is 125581891. The next prime is 125581921. The reversal of 125581903 is 309185521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 309185521 = 6263 ⋅49367.

It is a cyclic number.

It is not a de Polignac number, because 125581903 - 2⁵ = 125581871 is a prime.

It is a super-2 number, since 2×125581903² = 31541628722202818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125581933) 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, 52828 + ... + 55153.

It is an arithmetic number, because the mean of its divisors is an integer number (31422762).

Almost surely, 2^125581903 is an apocalyptic number.

125581903 is a deficient number, since it is larger than the sum of its proper divisors (109145).

125581903 is a wasteful number, since it uses less digits than its factorization.

125581903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109144.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 125581903 is about 11206.3331647779. Note that the first 3 decimals coincide. The cubic root of 125581903 is about 500.7746698202.

The spelling of 125581903 in words is "one hundred twenty-five million, five hundred eighty-one thousand, nine hundred three".