1155813 has 16 divisors (see below), whose sum is σ = 1653696. Its totient is φ = 715520.

The previous prime is 1155733. The next prime is 1155821. The reversal of 1155813 is 3185511.

It is a cyclic number.

It is not a de Polignac number, because 1155813 - 2¹⁰ = 1154789 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155823) 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, 6595 + ... + 6767.

It is an arithmetic number, because the mean of its divisors is an integer number (103356).

2^1155813 is an apocalyptic number.

It is an amenable number.

1155813 is a deficient number, since it is larger than the sum of its proper divisors (497883).

1155813 is a wasteful number, since it uses less digits than its factorization.

1155813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324.

The product of its digits is 600, while the sum is 24.

The square root of 1155813 is about 1075.0874383044. The cubic root of 1155813 is about 104.9451868103.

The spelling of 1155813 in words is "one million, one hundred fifty-five thousand, eight hundred thirteen".