1321791 has 8 divisors (see below), whose sum is σ = 1823280. Its totient is φ = 850752.

The previous prime is 1321769. The next prime is 1321813. The reversal of 1321791 is 1971231.

It is an interprime number because it is at equal distance from previous prime (1321769) and next prime (1321813).

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

It is not a de Polignac number, because 1321791 - 2⁵ = 1321759 is a prime.

1321791 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321711) 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, 7510 + ... + 7683.

It is an arithmetic number, because the mean of its divisors is an integer number (227910).

2^1321791 is an apocalyptic number.

1321791 is a deficient number, since it is larger than the sum of its proper divisors (501489).

1321791 is a wasteful number, since it uses less digits than its factorization.

1321791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15225.

The product of its digits is 378, while the sum is 24.

The square root of 1321791 is about 1149.6916978042. The cubic root of 1321791 is about 109.7457211955.

It can be divided in two parts, 1321 and 791, that added together give a palindrome (2112).

The spelling of 1321791 in words is "one million, three hundred twenty-one thousand, seven hundred ninety-one".