1156139 has 4 divisors (see below), whose sum is σ = 1187424. Its totient is φ = 1124856.

The previous prime is 1156121. The next prime is 1156151. The reversal of 1156139 is 9316511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1156139 - 2²⁰ = 107563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156109) 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, 15587 + ... + 15660.

It is an arithmetic number, because the mean of its divisors is an integer number (296856).

2^1156139 is an apocalyptic number.

1156139 is a deficient number, since it is larger than the sum of its proper divisors (31285).

1156139 is an equidigital number, since it uses as much as digits as its factorization.

1156139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31284.

The product of its digits is 810, while the sum is 26.

The square root of 1156139 is about 1075.2390431899. The cubic root of 1156139 is about 104.9550525686.

The spelling of 1156139 in words is "one million, one hundred fifty-six thousand, one hundred thirty-nine".