1155003213 has 64 divisors (see below), whose sum is σ = 2046320640. Its totient is φ = 562560768.

The previous prime is 1155003209. The next prime is 1155003233. The reversal of 1155003213 is 3123005511.

It is not a de Polignac number, because 1155003213 - 2² = 1155003209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 1155003213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155003233) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 178920 + ... + 185262.

It is an arithmetic number, because the mean of its divisors is an integer number (31973760).

Almost surely, 2^1155003213 is an apocalyptic number.

1155003213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1155003213 is a deficient number, since it is larger than the sum of its proper divisors (891317427).

1155003213 is a wasteful number, since it uses less digits than its factorization.

1155003213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6418.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 1155003213 is about 33985.3382063501. The cubic root of 1155003213 is about 1049.2067214612.

Adding to 1155003213 its reverse (3123005511), we get a palindrome (4278008724).

The spelling of 1155003213 in words is "one billion, one hundred fifty-five million, three thousand, two hundred thirteen".