125781787 has 16 divisors (see below), whose sum is σ = 135233280. Its totient is φ = 116726400.

The previous prime is 125781781. The next prime is 125781791. The reversal of 125781787 is 787187521.

It is a cyclic number.

It is not a de Polignac number, because 125781787 - 2⁷ = 125781659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125781781) 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, 162333 + ... + 163105.

It is an arithmetic number, because the mean of its divisors is an integer number (8452080).

Almost surely, 2^125781787 is an apocalyptic number.

125781787 is a deficient number, since it is larger than the sum of its proper divisors (9451493).

125781787 is a wasteful number, since it uses less digits than its factorization.

125781787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014.

The product of its digits is 219520, while the sum is 46.

The square root of 125781787 is about 11215.2479687254. The cubic root of 125781787 is about 501.0402170628.

It can be divided in two parts, 12578 and 1787, that added together give a triangular number (14365 = T₁₆₉).

The spelling of 125781787 in words is "one hundred twenty-five million, seven hundred eighty-one thousand, seven hundred eighty-seven".