1320688247 has 4 divisors (see below), whose sum is σ = 1342338936. Its totient is φ = 1299037560.

The previous prime is 1320688241. The next prime is 1320688277. The reversal of 1320688247 is 7428860231.

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

It is a cyclic number.

It is not a de Polignac number, because 1320688247 - 2¹⁸ = 1320426103 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 (1320688241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10825253 + ... + 10825374.

It is an arithmetic number, because the mean of its divisors is an integer number (335584734).

Almost surely, 2^1320688247 is an apocalyptic number.

1320688247 is a deficient number, since it is larger than the sum of its proper divisors (21650689).

1320688247 is an equidigital number, since it uses as much as digits as its factorization.

1320688247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21650688.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 1320688247 is about 36341.2747024647. The cubic root of 1320688247 is about 1097.1519289597.

The spelling of 1320688247 in words is "one billion, three hundred twenty million, six hundred eighty-eight thousand, two hundred forty-seven".