125765781 has 16 divisors (see below), whose sum is σ = 169942656. Its totient is φ = 82722816.

The previous prime is 125765743. The next prime is 125765789. The reversal of 125765781 is 187567521.

It is not a de Polignac number, because 125765781 - 2¹⁰ = 125764757 is a prime.

It is a super-2 number, since 2×125765781² = 31634063341079922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125765789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108501 + ... + 109653.

It is an arithmetic number, because the mean of its divisors is an integer number (10621416).

Almost surely, 2^125765781 is an apocalyptic number.

It is an amenable number.

125765781 is a deficient number, since it is larger than the sum of its proper divisors (44176875).

125765781 is a wasteful number, since it uses less digits than its factorization.

125765781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612.

The product of its digits is 117600, while the sum is 42.

The square root of 125765781 is about 11214.5343639404. The cubic root of 125765781 is about 501.0189633501.

The spelling of 125765781 in words is "one hundred twenty-five million, seven hundred sixty-five thousand, seven hundred eighty-one".