1155243 has 4 divisors (see below), whose sum is σ = 1540328. Its totient is φ = 770160.

The previous prime is 1155239. The next prime is 1155247. The reversal of 1155243 is 3425511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3425511 = 3 ⋅1141837.

It is an interprime number because it is at equal distance from previous prime (1155239) and next prime (1155247).

It is not a de Polignac number, because 1155243 - 2² = 1155239 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192538 + ... + 192543.

It is an arithmetic number, because the mean of its divisors is an integer number (385082).

2^1155243 is an apocalyptic number.

1155243 is a deficient number, since it is larger than the sum of its proper divisors (385085).

1155243 is an equidigital number, since it uses as much as digits as its factorization.

1155243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385084.

The product of its digits is 600, while the sum is 21.

The square root of 1155243 is about 1074.8223108961. The cubic root of 1155243 is about 104.9279324066.

The spelling of 1155243 in words is "one million, one hundred fifty-five thousand, two hundred forty-three".