1205011253 has 4 divisors (see below), whose sum is σ = 1220264640. Its totient is φ = 1189757868.

The previous prime is 1205011243. The next prime is 1205011303. The reversal of 1205011253 is 3521105021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1205011253 - 2⁸ = 1205010997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205011243) 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, 7626575 + ... + 7626732.

It is an arithmetic number, because the mean of its divisors is an integer number (305066160).

Almost surely, 2^1205011253 is an apocalyptic number.

It is an amenable number.

1205011253 is a deficient number, since it is larger than the sum of its proper divisors (15253387).

1205011253 is an equidigital number, since it uses as much as digits as its factorization.

1205011253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15253386.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1205011253 is about 34713.2720007780. The cubic root of 1205011253 is about 1064.1357512007.

Adding to 1205011253 its reverse (3521105021), we get a palindrome (4726116274).

The spelling of 1205011253 in words is "one billion, two hundred five million, eleven thousand, two hundred fifty-three".