125867681 has 2 divisors, whose sum is σ = 125867682. Its totient is φ = 125867680.

The previous prime is 125867653. The next prime is 125867689. The reversal of 125867681 is 186768521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77440000 + 48427681 = 8800^2 + 6959^2 .

It is a cyclic number.

It is not a de Polignac number, because 125867681 - 2⁶ = 125867617 is a prime.

It is a super-2 number, since 2×125867681² = 31685346240635522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125867689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62933840 + 62933841.

It is an arithmetic number, because the mean of its divisors is an integer number (62933841).

Almost surely, 2^125867681 is an apocalyptic number.

It is an amenable number.

125867681 is a deficient number, since it is larger than the sum of its proper divisors (1).

125867681 is an equidigital number, since it uses as much as digits as its factorization.

125867681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 44.

The square root of 125867681 is about 11219.0766554115. The cubic root of 125867681 is about 501.1542414032.

The spelling of 125867681 in words is "one hundred twenty-five million, eight hundred sixty-seven thousand, six hundred eighty-one".