125031805 has 4 divisors (see below), whose sum is σ = 150038172. Its totient is φ = 100025440.

The previous prime is 125031791. The next prime is 125031811. The reversal of 125031805 is 508130521.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 65464281 + 59567524 = 8091^2 + 7718^2 .

It is not a de Polignac number, because 125031805 - 2¹¹ = 125029757 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125031805.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12503176 + ... + 12503185.

It is an arithmetic number, because the mean of its divisors is an integer number (37509543).

Almost surely, 2^125031805 is an apocalyptic number.

It is an amenable number.

125031805 is a deficient number, since it is larger than the sum of its proper divisors (25006367).

125031805 is an equidigital number, since it uses as much as digits as its factorization.

125031805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25006366.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 125031805 is about 11181.7621598744. The cubic root of 125031805 is about 500.0424030705.

The spelling of 125031805 in words is "one hundred twenty-five million, thirty-one thousand, eight hundred five".