1620440611 has 2 divisors, whose sum is σ = 1620440612. Its totient is φ = 1620440610.

The previous prime is 1620440609. The next prime is 1620440617. The reversal of 1620440611 is 1160440261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1620440611 - 2¹ = 1620440609 is a prime.

Together with 1620440609, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1620440617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810220305 + 810220306.

It is an arithmetic number, because the mean of its divisors is an integer number (810220306).

Almost surely, 2^1620440611 is an apocalyptic number.

1620440611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620440611 is an equidigital number, since it uses as much as digits as its factorization.

1620440611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1620440611 is about 40254.6967570245. The cubic root of 1620440611 is about 1174.5667600905.

Adding to 1620440611 its reverse (1160440261), we get a palindrome (2780880872).

The spelling of 1620440611 in words is "one billion, six hundred twenty million, four hundred forty thousand, six hundred eleven".