1320218157 has 4 divisors (see below), whose sum is σ = 1760290880. Its totient is φ = 880145436.

The previous prime is 1320218099. The next prime is 1320218189. The reversal of 1320218157 is 7518120231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1320218157 - 2⁶ = 1320218093 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 (1320211157) 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, 220036357 + ... + 220036362.

It is an arithmetic number, because the mean of its divisors is an integer number (440072720).

Almost surely, 2^1320218157 is an apocalyptic number.

It is an amenable number.

1320218157 is a deficient number, since it is larger than the sum of its proper divisors (440072723).

1320218157 is an equidigital number, since it uses as much as digits as its factorization.

1320218157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440072722.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 1320218157 is about 36334.8064120342. The cubic root of 1320218157 is about 1097.0217389224.

Adding to 1320218157 its reverse (7518120231), we get a palindrome (8838338388).

The spelling of 1320218157 in words is "one billion, three hundred twenty million, two hundred eighteen thousand, one hundred fifty-seven".