1156813 has 8 divisors (see below), whose sum is σ = 1344960. Its totient is φ = 974400.

The previous prime is 1156807. The next prime is 1156819. The reversal of 1156813 is 3186511.

It is an interprime number because it is at equal distance from previous prime (1156807) and next prime (1156819).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1156813 - 2¹³ = 1148621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 988 + ... + 1813.

It is an arithmetic number, because the mean of its divisors is an integer number (168120).

2^1156813 is an apocalyptic number.

It is an amenable number.

1156813 is a deficient number, since it is larger than the sum of its proper divisors (188147).

1156813 is an equidigital number, since it uses as much as digits as its factorization.

1156813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2867.

The product of its digits is 720, while the sum is 25.

The square root of 1156813 is about 1075.5524162029. The cubic root of 1156813 is about 104.9754439931.

The spelling of 1156813 in words is "one million, one hundred fifty-six thousand, eight hundred thirteen".