1320311977 has 2 divisors, whose sum is σ = 1320311978. Its totient is φ = 1320311976.

The previous prime is 1320311969. The next prime is 1320312011. The reversal of 1320311977 is 7791130231.

It is an a-pointer prime, because the next prime (1320312011) can be obtained adding 1320311977 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1041288361 + 279023616 = 32269^2 + 16704^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320311977 - 2³ = 1320311969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1320311077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660155988 + 660155989.

It is an arithmetic number, because the mean of its divisors is an integer number (660155989).

Almost surely, 2^1320311977 is an apocalyptic number.

It is an amenable number.

1320311977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320311977 is an equidigital number, since it uses as much as digits as its factorization.

1320311977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7938, while the sum is 34.

The square root of 1320311977 is about 36336.0974376721. The cubic root of 1320311977 is about 1097.0477245625.

The spelling of 1320311977 in words is "one billion, three hundred twenty million, three hundred eleven thousand, nine hundred seventy-seven".