125863921 has 2 divisors, whose sum is σ = 125863922. Its totient is φ = 125863920.

The previous prime is 125863909. The next prime is 125863931. The reversal of 125863921 is 129368521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66650896 + 59213025 = 8164^2 + 7695^2 .

It is a cyclic number.

It is not a de Polignac number, because 125863921 - 2¹³ = 125855729 is a prime.

It is not a weakly prime, because it can be changed into another prime (125863931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62931960 + 62931961.

It is an arithmetic number, because the mean of its divisors is an integer number (62931961).

Almost surely, 2^125863921 is an apocalyptic number.

It is an amenable number.

125863921 is a deficient number, since it is larger than the sum of its proper divisors (1).

125863921 is an equidigital number, since it uses as much as digits as its factorization.

125863921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 125863921 is about 11218.9090824376. The cubic root of 125863921 is about 501.1492510867.

The spelling of 125863921 in words is "one hundred twenty-five million, eight hundred sixty-three thousand, nine hundred twenty-one".