1620640111 has 2 divisors, whose sum is σ = 1620640112. Its totient is φ = 1620640110.

The previous prime is 1620640097. The next prime is 1620640127. The reversal of 1620640111 is 1110460261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1620640111 - 2⁵ = 1620640079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620640211) 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, 810320055 + 810320056.

It is an arithmetic number, because the mean of its divisors is an integer number (810320056).

Almost surely, 2^1620640111 is an apocalyptic number.

1620640111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620640111 is an equidigital number, since it uses as much as digits as its factorization.

1620640111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1620640111 is about 40257.1746524765. The cubic root of 1620640111 is about 1174.6149602429.

The spelling of 1620640111 in words is "one billion, six hundred twenty million, six hundred forty thousand, one hundred eleven".