125819761 has 2 divisors, whose sum is σ = 125819762. Its totient is φ = 125819760.

The previous prime is 125819723. The next prime is 125819779. The reversal of 125819761 is 167918521.

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., 102394161 + 23425600 = 10119^2 + 4840^2 .

It is an emirp because it is prime and its reverse (167918521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125819761 - 2⁹ = 125819249 is a prime.

It is a super-2 number, since 2×125819761² = 31661224516194242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (125819791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62909880 + 62909881.

It is an arithmetic number, because the mean of its divisors is an integer number (62909881).

Almost surely, 2^125819761 is an apocalyptic number.

It is an amenable number.

125819761 is a deficient number, since it is larger than the sum of its proper divisors (1).

125819761 is an equidigital number, since it uses as much as digits as its factorization.

125819761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 40.

The square root of 125819761 is about 11216.9408039804. The cubic root of 125819761 is about 501.0906339720.

The spelling of 125819761 in words is "one hundred twenty-five million, eight hundred nineteen thousand, seven hundred sixty-one".