1319991 has 8 divisors (see below), whose sum is σ = 1772400. Its totient is φ = 873792.

The previous prime is 1319963. The next prime is 1320019. The reversal of 1319991 is 1999131.

It is an interprime number because it is at equal distance from previous prime (1319963) and next prime (1320019).

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

It is not a de Polignac number, because 1319991 - 2¹³ = 1311799 is a prime.

1319991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1319951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1030 + ... + 1923.

It is an arithmetic number, because the mean of its divisors is an integer number (221550).

2^1319991 is an apocalyptic number.

1319991 is a deficient number, since it is larger than the sum of its proper divisors (452409).

1319991 is a wasteful number, since it uses less digits than its factorization.

1319991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105.

The product of its digits is 2187, while the sum is 33.

The square root of 1319991 is about 1148.9086125537. The cubic root of 1319991 is about 109.6958817387.

The spelling of 1319991 in words is "one million, three hundred nineteen thousand, nine hundred ninety-one".