1320579917 has 2 divisors, whose sum is σ = 1320579918. Its totient is φ = 1320579916.

The previous prime is 1320579833. The next prime is 1320579973. The reversal of 1320579917 is 7199750231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 810768676 + 509811241 = 28474^2 + 22579^2 .

It is an emirp because it is prime and its reverse (7199750231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1320579917 - 2¹⁴ = 1320563533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320579317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660289958 + 660289959.

It is an arithmetic number, because the mean of its divisors is an integer number (660289959).

Almost surely, 2^1320579917 is an apocalyptic number.

It is an amenable number.

1320579917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320579917 is an equidigital number, since it uses as much as digits as its factorization.

1320579917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 119070, while the sum is 44.

The square root of 1320579917 is about 36339.7842178514. The cubic root of 1320579917 is about 1097.1219300258.

The spelling of 1320579917 in words is "one billion, three hundred twenty million, five hundred seventy-nine thousand, nine hundred seventeen".