1205251113 has 16 divisors (see below), whose sum is σ = 1767586752. Its totient is φ = 730452800.

The previous prime is 1205251087. The next prime is 1205251123. The reversal of 1205251113 is 3111525021.

It is not a de Polignac number, because 1205251113 - 2²⁰ = 1204202537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1205251113.

It is not an unprimeable number, because it can be changed into a prime (1205251123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146928 + ... + 154913.

It is an arithmetic number, because the mean of its divisors is an integer number (110474172).

Almost surely, 2^1205251113 is an apocalyptic number.

It is an amenable number.

1205251113 is a deficient number, since it is larger than the sum of its proper divisors (562335639).

1205251113 is an equidigital number, since it uses as much as digits as its factorization.

1205251113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301877 (or 301855 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 1205251113 is about 34716.7267034206. The cubic root of 1205251113 is about 1064.2063526625.

Adding to 1205251113 its reverse (3111525021), we get a palindrome (4316776134).

The spelling of 1205251113 in words is "one billion, two hundred five million, two hundred fifty-one thousand, one hundred thirteen".