1320751 has 2 divisors, whose sum is σ = 1320752. Its totient is φ = 1320750.

The previous prime is 1320749. The next prime is 1320773. The reversal of 1320751 is 1570231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1320751 - 2¹ = 1320749 is a prime.

Together with 1320749, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660375 + 660376.

It is an arithmetic number, because the mean of its divisors is an integer number (660376).

2^1320751 is an apocalyptic number.

1320751 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320751 is an equidigital number, since it uses as much as digits as its factorization.

1320751 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 1320751 is about 1149.2393136332. The cubic root of 1320751 is about 109.7169305880.

Adding to 1320751 its reverse (1570231), we get a palindrome (2890982).

The spelling of 1320751 in words is "one million, three hundred twenty thousand, seven hundred fifty-one".