1205125321 has 2 divisors, whose sum is σ = 1205125322. Its totient is φ = 1205125320.

The previous prime is 1205125307. The next prime is 1205125343. The reversal of 1205125321 is 1235215021.

It is an a-pointer prime, because the next prime (1205125343) can be obtained adding 1205125321 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 741799696 + 463325625 = 27236^2 + 21525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1205125321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1205125292 and 1205125301.

It is not a weakly prime, because it can be changed into another prime (1205125351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602562660 + 602562661.

It is an arithmetic number, because the mean of its divisors is an integer number (602562661).

Almost surely, 2^1205125321 is an apocalyptic number.

It is an amenable number.

1205125321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205125321 is an equidigital number, since it uses as much as digits as its factorization.

1205125321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1205125321 is about 34714.9149646085. The cubic root of 1205125321 is about 1064.1693276526.

The spelling of 1205125321 in words is "one billion, two hundred five million, one hundred twenty-five thousand, three hundred twenty-one".