1205249113 has 2 divisors, whose sum is σ = 1205249114. Its totient is φ = 1205249112.

The previous prime is 1205249083. The next prime is 1205249117. The reversal of 1205249113 is 3119425021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1081883664 + 123365449 = 32892^2 + 11107^2 .

It is an emirp because it is prime and its reverse (3119425021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1205249113 - 2⁵ = 1205249081 is a prime.

It is not a weakly prime, because it can be changed into another prime (1205249117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602624556 + 602624557.

It is an arithmetic number, because the mean of its divisors is an integer number (602624557).

Almost surely, 2^1205249113 is an apocalyptic number.

It is an amenable number.

1205249113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205249113 is an equidigital number, since it uses as much as digits as its factorization.

1205249113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1205249113 is about 34716.6978988498. The cubic root of 1205249113 is about 1064.2057640123.

The spelling of 1205249113 in words is "one billion, two hundred five million, two hundred forty-nine thousand, one hundred thirteen".