125209321 has 2 divisors, whose sum is σ = 125209322. Its totient is φ = 125209320.

The previous prime is 125209313. The next prime is 125209333. The reversal of 125209321 is 123902521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70744921 + 54464400 = 8411^2 + 7380^2 .

It is an emirp because it is prime and its reverse (123902521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125209321 - 2³ = 125209313 is a prime.

It is not a weakly prime, because it can be changed into another prime (125209361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62604660 + 62604661.

It is an arithmetic number, because the mean of its divisors is an integer number (62604661).

Almost surely, 2^125209321 is an apocalyptic number.

It is an amenable number.

125209321 is a deficient number, since it is larger than the sum of its proper divisors (1).

125209321 is an equidigital number, since it uses as much as digits as its factorization.

125209321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 125209321 is about 11189.6970915213. The cubic root of 125209321 is about 500.2789390238.

The spelling of 125209321 in words is "one hundred twenty-five million, two hundred nine thousand, three hundred twenty-one".