1155913 has 12 divisors (see below), whose sum is σ = 1307124. Its totient is φ = 1020800.

The previous prime is 1155907. The next prime is 1155919. The reversal of 1155913 is 3195511.

It is an interprime number because it is at equal distance from previous prime (1155907) and next prime (1155919).

It can be written as a sum of positive squares in 2 ways, for example, as 131769 + 1024144 = 363^2 + 1012^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1155913 is a prime.

It is a super-3 number, since 3×1155913³ = 4633366975657900491, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4845 + ... + 5077.

It is an arithmetic number, because the mean of its divisors is an integer number (108927).

2^1155913 is an apocalyptic number.

It is an amenable number.

1155913 is a deficient number, since it is larger than the sum of its proper divisors (151211).

1155913 is a wasteful number, since it uses less digits than its factorization.

1155913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296 (or 285 counting only the distinct ones).

The product of its digits is 675, while the sum is 25.

The square root of 1155913 is about 1075.1339451436. The cubic root of 1155913 is about 104.9482133138.

The spelling of 1155913 in words is "one million, one hundred fifty-five thousand, nine hundred thirteen".