125621 has 2 divisors, whose sum is σ = 125622. Its totient is φ = 125620.

The previous prime is 125617. The next prime is 125627. The reversal of 125621 is 126521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96721 + 28900 = 311^2 + 170^2 .

It is a cyclic number.

It is not a de Polignac number, because 125621 - 2² = 125617 is a prime.

It is a Chen prime.

It is a plaindrome in base 14.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 125621.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 125621.

It is not a weakly prime, because it can be changed into another prime (125627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62810 + 62811.

It is an arithmetic number, because the mean of its divisors is an integer number (62811).

2¹²⁵⁶²¹ is an apocalyptic number.

It is an amenable number.

125621 is a deficient number, since it is larger than the sum of its proper divisors (1).

125621 is an equidigital number, since it uses as much as digits as its factorization.

125621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120, while the sum is 17.

The square root of 125621 is about 354.4305291591. The cubic root of 125621 is about 50.0826632604.

Subtracting 125621 from its reverse (126521), we obtain a square (900 = 30²).

The spelling of 125621 in words is "one hundred twenty-five thousand, six hundred twenty-one".