1155532313 has 16 divisors (see below), whose sum is σ = 1336196736. Its totient is φ = 989748480.

The previous prime is 1155532303. The next prime is 1155532349. The reversal of 1155532313 is 3132355511.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1155532313 - 2⁴ = 1155532297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1155532303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21131 + ... + 52512.

It is an arithmetic number, because the mean of its divisors is an integer number (83512296).

Almost surely, 2^1155532313 is an apocalyptic number.

1155532313 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1155532313 is a deficient number, since it is larger than the sum of its proper divisors (180664423).

1155532313 is a wasteful number, since it uses less digits than its factorization.

1155532313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73744.

The product of its digits is 6750, while the sum is 29.

The square root of 1155532313 is about 33993.1215542203. The cubic root of 1155532313 is about 1049.3669087587.

Adding to 1155532313 its reverse (3132355511), we get a palindrome (4287887824).

The spelling of 1155532313 in words is "one billion, one hundred fifty-five million, five hundred thirty-two thousand, three hundred thirteen".