1139001 has 4 divisors (see below), whose sum is σ = 1518672. Its totient is φ = 759332.

The previous prime is 1138999. The next prime is 1139003. The reversal of 1139001 is 1009311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1009311 = 3 ⋅336437.

It is an interprime number because it is at equal distance from previous prime (1138999) and next prime (1139003).

It is a cyclic number.

It is not a de Polignac number, because 1139001 - 2¹ = 1138999 is a prime.

It is a D-number.

1139001 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1139003) 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, 189831 + ... + 189836.

It is an arithmetic number, because the mean of its divisors is an integer number (379668).

2^1139001 is an apocalyptic number.

It is an amenable number.

1139001 is a deficient number, since it is larger than the sum of its proper divisors (379671).

1139001 is an equidigital number, since it uses as much as digits as its factorization.

1139001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379670.

The product of its (nonzero) digits is 27, while the sum is 15.

The square root of 1139001 is about 1067.2398980548. The cubic root of 1139001 is about 104.4338691655.

The spelling of 1139001 in words is "one million, one hundred thirty-nine thousand, one".