1320971 has 4 divisors (see below), whose sum is σ = 1333200. Its totient is φ = 1308744.

The previous prime is 1320961. The next prime is 1320973. The reversal of 1320971 is 1790231.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320971 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320973) 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, 5951 + ... + 6168.

It is an arithmetic number, because the mean of its divisors is an integer number (333300).

2^1320971 is an apocalyptic number.

1320971 is a deficient number, since it is larger than the sum of its proper divisors (12229).

1320971 is a wasteful number, since it uses less digits than its factorization.

1320971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12228.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 1320971 is about 1149.3350251341. The cubic root of 1320971 is about 109.7230221689.

The spelling of 1320971 in words is "one million, three hundred twenty thousand, nine hundred seventy-one".