1320077491 has 2 divisors, whose sum is σ = 1320077492. Its totient is φ = 1320077490.

The previous prime is 1320077471. The next prime is 1320077621. The reversal of 1320077491 is 1947700231.

It is a weak prime.

It is an emirp because it is prime and its reverse (1947700231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1320077491 - 2¹¹ = 1320075443 is a prime.

It is not a weakly prime, because it can be changed into another prime (1320077411) 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 as a sum of consecutive naturals, namely, 660038745 + 660038746.

It is an arithmetic number, because the mean of its divisors is an integer number (660038746).

Almost surely, 2^1320077491 is an apocalyptic number.

1320077491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320077491 is an equidigital number, since it uses as much as digits as its factorization.

1320077491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 1320077491 is about 36332.8706683081. The cubic root of 1320077491 is about 1096.9827758819.

The spelling of 1320077491 in words is "one billion, three hundred twenty million, seventy-seven thousand, four hundred ninety-one".