1155139 has 4 divisors (see below), whose sum is σ = 1162224. Its totient is φ = 1148056.

The previous prime is 1155127. The next prime is 1155149. The reversal of 1155139 is 9315511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9315511 = 283 ⋅32917.

It is a cyclic number.

It is not a de Polignac number, because 1155139 - 2⁵ = 1155107 is a prime.

It is a super-2 number, since 2×1155139² = 2668692218642, which contains 22 as substring.

It is a Duffinian number.

1155139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1155149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3292 + ... + 3625.

It is an arithmetic number, because the mean of its divisors is an integer number (290556).

2^1155139 is an apocalyptic number.

1155139 is a deficient number, since it is larger than the sum of its proper divisors (7085).

1155139 is an equidigital number, since it uses as much as digits as its factorization.

1155139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7084.

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

The square root of 1155139 is about 1074.7739297173. The cubic root of 1155139 is about 104.9247836224.

The spelling of 1155139 in words is "one million, one hundred fifty-five thousand, one hundred thirty-nine".