1321620877 has 2 divisors, whose sum is σ = 1321620878. Its totient is φ = 1321620876.

The previous prime is 1321620847. The next prime is 1321620893. The reversal of 1321620877 is 7780261231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 957345481 + 364275396 = 30941^2 + 19086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321620877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321620847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660810438 + 660810439.

It is an arithmetic number, because the mean of its divisors is an integer number (660810439).

Almost surely, 2^1321620877 is an apocalyptic number.

It is an amenable number.

1321620877 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321620877 is an equidigital number, since it uses as much as digits as its factorization.

1321620877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 1321620877 is about 36354.1039911590. The cubic root of 1321620877 is about 1097.4101266685.

The spelling of 1321620877 in words is "one billion, three hundred twenty-one million, six hundred twenty thousand, eight hundred seventy-seven".