1155005213 has 4 divisors (see below), whose sum is σ = 1179579840. Its totient is φ = 1130430588.

The previous prime is 1155005167. The next prime is 1155005221. The reversal of 1155005213 is 3125005511.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3125005511 = 37397 ⋅83563.

It is a cyclic number.

It is not a de Polignac number, because 1155005213 - 2¹⁰ = 1155004189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155007213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12287243 + ... + 12287336.

It is an arithmetic number, because the mean of its divisors is an integer number (294894960).

Almost surely, 2^1155005213 is an apocalyptic number.

It is an amenable number.

1155005213 is a deficient number, since it is larger than the sum of its proper divisors (24574627).

1155005213 is an equidigital number, since it uses as much as digits as its factorization.

1155005213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24574626.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 1155005213 is about 33985.3676307908. The cubic root of 1155005213 is about 1049.2073270619.

The spelling of 1155005213 in words is "one billion, one hundred fifty-five million, five thousand, two hundred thirteen".