125766781 has 14 divisors (see below), whose sum is σ = 146864990. Its totient is φ = 107699256.

The previous prime is 125766743. The next prime is 125766791. The reversal of 125766781 is 187667521.

It can be written as a sum of positive squares in only one way, i.e., 105884100 + 19882681 = 10290^2 + 4459^2 .

It is not a de Polignac number, because 125766781 - 2⁹ = 125766269 is a prime.

It is a super-2 number, since 2×125766781² = 31634566406203922, 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 (125766791) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 117115 + ... + 118183.

Almost surely, 2^125766781 is an apocalyptic number.

It is an amenable number.

125766781 is a deficient number, since it is larger than the sum of its proper divisors (21098209).

125766781 is an frugal number, since it uses more digits than its factorization.

125766781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111 (or 1076 counting only the distinct ones).

The product of its digits is 141120, while the sum is 43.

The square root of 125766781 is about 11214.5789488505. The cubic root of 125766781 is about 501.0202912620.

The spelling of 125766781 in words is "one hundred twenty-five million, seven hundred sixty-six thousand, seven hundred eighty-one".