125781005 has 16 divisors (see below), whose sum is σ = 172683264. Its totient is φ = 86158080.

The previous prime is 125780987. The next prime is 125781013. The reversal of 125781005 is 500187521.

It is not a de Polignac number, because 125781005 - 2⁸ = 125780749 is a prime.

It is a super-2 number, since 2×125781005² = 31641722437620050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57125 + ... + 59285.

It is an arithmetic number, because the mean of its divisors is an integer number (10792704).

Almost surely, 2^125781005 is an apocalyptic number.

It is an amenable number.

125781005 is a deficient number, since it is larger than the sum of its proper divisors (46902259).

125781005 is a wasteful number, since it uses less digits than its factorization.

125781005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3836.

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 125781005 is about 11215.2131054207. The cubic root of 125781005 is about 501.0391787189.

The spelling of 125781005 in words is "one hundred twenty-five million, seven hundred eighty-one thousand, five".