125663851 has 2 divisors, whose sum is σ = 125663852. Its totient is φ = 125663850.

The previous prime is 125663849. The next prime is 125663911. The reversal of 125663851 is 158366521.

It is a weak prime.

It is an emirp because it is prime and its reverse (158366521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125663851 - 2¹ = 125663849 is a prime.

Together with 125663849, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 125663851.

It is not a weakly prime, because it can be changed into another prime (125663821) 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, 62831925 + 62831926.

It is an arithmetic number, because the mean of its divisors is an integer number (62831926).

Almost surely, 2^125663851 is an apocalyptic number.

125663851 is a deficient number, since it is larger than the sum of its proper divisors (1).

125663851 is an equidigital number, since it uses as much as digits as its factorization.

125663851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 37.

The square root of 125663851 is about 11209.9888938393. The cubic root of 125663851 is about 500.8835723467.

The spelling of 125663851 in words is "one hundred twenty-five million, six hundred sixty-three thousand, eight hundred fifty-one".