1205405053 has 4 divisors (see below), whose sum is σ = 1218949020. Its totient is φ = 1191861088.

The previous prime is 1205405051. The next prime is 1205405063. The reversal of 1205405053 is 3505045021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 838797444 + 366607609 = 28962^2 + 19147^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205405053 - 2¹ = 1205405051 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 (1205405051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6771850 + ... + 6772027.

It is an arithmetic number, because the mean of its divisors is an integer number (304737255).

Almost surely, 2^1205405053 is an apocalyptic number.

It is an amenable number.

1205405053 is a deficient number, since it is larger than the sum of its proper divisors (13543967).

1205405053 is an equidigital number, since it uses as much as digits as its factorization.

1205405053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13543966.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 1205405053 is about 34718.9437195316. The cubic root of 1205405053 is about 1064.2516591135.

The spelling of 1205405053 in words is "one billion, two hundred five million, four hundred five thousand, fifty-three".