125661623 has 2 divisors, whose sum is σ = 125661624. Its totient is φ = 125661622.

The previous prime is 125661607. The next prime is 125661629. The reversal of 125661623 is 326166521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 125661623 - 2⁴ = 125661607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125661623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125661629) 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, 62830811 + 62830812.

It is an arithmetic number, because the mean of its divisors is an integer number (62830812).

Almost surely, 2^125661623 is an apocalyptic number.

125661623 is a deficient number, since it is larger than the sum of its proper divisors (1).

125661623 is an equidigital number, since it uses as much as digits as its factorization.

125661623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 32.

The square root of 125661623 is about 11209.8895177428. The cubic root of 125661623 is about 500.8806121340.

The spelling of 125661623 in words is "one hundred twenty-five million, six hundred sixty-one thousand, six hundred twenty-three".