125805019 has 2 divisors, whose sum is σ = 125805020. Its totient is φ = 125805018.

The previous prime is 125805013. The next prime is 125805079. The reversal of 125805019 is 910508521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125805019 - 2³ = 125805011 is a prime.

It is a super-4 number, since 4×125805019⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (125805011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62902509 + 62902510.

It is an arithmetic number, because the mean of its divisors is an integer number (62902510).

Almost surely, 2^125805019 is an apocalyptic number.

125805019 is a deficient number, since it is larger than the sum of its proper divisors (1).

125805019 is an equidigital number, since it uses as much as digits as its factorization.

125805019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 125805019 is about 11216.2836536885. The cubic root of 125805019 is about 501.0710626779.

The spelling of 125805019 in words is "one hundred twenty-five million, eight hundred five thousand, nineteen".