1155405205 has 4 divisors (see below), whose sum is σ = 1386486252. Its totient is φ = 924324160.

The previous prime is 1155405203. The next prime is 1155405259. The reversal of 1155405205 is 5025045511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5025045511 = 83 ⋅60542717.

It can be written as a sum of positive squares in 2 ways, for example, as 660387204 + 495018001 = 25698^2 + 22249^2 .

It is not a de Polignac number, because 1155405205 - 2¹ = 1155405203 is a prime.

It is a super-2 number, since 2×1155405205² = 2669922375482184050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155405203) 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, 115540516 + ... + 115540525.

It is an arithmetic number, because the mean of its divisors is an integer number (346621563).

Almost surely, 2^1155405205 is an apocalyptic number.

It is an amenable number.

1155405205 is a deficient number, since it is larger than the sum of its proper divisors (231081047).

1155405205 is an equidigital number, since it uses as much as digits as its factorization.

1155405205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231081046.

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 1155405205 is about 33991.2518892729. The cubic root of 1155405205 is about 1049.3284307290.

The spelling of 1155405205 in words is "one billion, one hundred fifty-five million, four hundred five thousand, two hundred five".