1620660311 has 2 divisors, whose sum is σ = 1620660312. Its totient is φ = 1620660310.

The previous prime is 1620660227. The next prime is 1620660317. The reversal of 1620660311 is 1130660261.

It is a strong prime.

It is an emirp because it is prime and its reverse (1130660261) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1620660311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620660317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810330155 + 810330156.

It is an arithmetic number, because the mean of its divisors is an integer number (810330156).

Almost surely, 2^1620660311 is an apocalyptic number.

1620660311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620660311 is an equidigital number, since it uses as much as digits as its factorization.

1620660311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1620660311 is about 40257.4255386506. The cubic root of 1620660311 is about 1174.6198404388.

The spelling of 1620660311 in words is "one billion, six hundred twenty million, six hundred sixty thousand, three hundred eleven".