1320077621 has 2 divisors, whose sum is σ = 1320077622. Its totient is φ = 1320077620.

The previous prime is 1320077491. The next prime is 1320077641. The reversal of 1320077621 is 1267700231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1318416100 + 1661521 = 36310^2 + 1289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320077621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320077641) 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, 660038810 + 660038811.

It is an arithmetic number, because the mean of its divisors is an integer number (660038811).

Almost surely, 2^1320077621 is an apocalyptic number.

It is an amenable number.

1320077621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320077621 is an equidigital number, since it uses as much as digits as its factorization.

1320077621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 1320077621 is about 36332.8724573216. The cubic root of 1320077621 is about 1096.9828118918.

Adding to 1320077621 its reverse (1267700231), we get a palindrome (2587777852).

The spelling of 1320077621 in words is "one billion, three hundred twenty million, seventy-seven thousand, six hundred twenty-one".