125865871 has 2 divisors, whose sum is σ = 125865872. Its totient is φ = 125865870.

The previous prime is 125865863. The next prime is 125865877. The reversal of 125865871 is 178568521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 125865871 - 2³ = 125865863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125865877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62932935 + 62932936.

It is an arithmetic number, because the mean of its divisors is an integer number (62932936).

Almost surely, 2^125865871 is an apocalyptic number.

125865871 is a deficient number, since it is larger than the sum of its proper divisors (1).

125865871 is an equidigital number, since it uses as much as digits as its factorization.

125865871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134400, while the sum is 43.

The square root of 125865871 is about 11218.9959889466. The cubic root of 125865871 is about 501.1518391622.

It can be divided in two parts, 125865 and 871, that added together give a square (126736 = 356²).

The spelling of 125865871 in words is "one hundred twenty-five million, eight hundred sixty-five thousand, eight hundred seventy-one".