1205125289 has 4 divisors (see below), whose sum is σ = 1227863556. Its totient is φ = 1182387024.

The previous prime is 1205125231. The next prime is 1205125297. The reversal of 1205125289 is 9825215021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9825215021 = 677 ⋅14512873.

It can be written as a sum of positive squares in 2 ways, for example, as 1097795689 + 107329600 = 33133^2 + 10360^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205125289 - 2¹⁶ = 1205059753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205124289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11369054 + ... + 11369159.

It is an arithmetic number, because the mean of its divisors is an integer number (306965889).

Almost surely, 2^1205125289 is an apocalyptic number.

It is an amenable number.

1205125289 is a deficient number, since it is larger than the sum of its proper divisors (22738267).

1205125289 is an equidigital number, since it uses as much as digits as its factorization.

1205125289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22738266.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 1205125289 is about 34714.9145037115. The cubic root of 1205125289 is about 1064.1693182335.

The spelling of 1205125289 in words is "one billion, two hundred five million, one hundred twenty-five thousand, two hundred eighty-nine".