1620643211 has 16 divisors (see below), whose sum is σ = 1839784320. Its totient is φ = 1414633920.

The previous prime is 1620643207. The next prime is 1620643223. The reversal of 1620643211 is 1123460261.

It is a cyclic number.

It is not a de Polignac number, because 1620643211 - 2² = 1620643207 is a prime.

It is not an unprimeable number, because it can be changed into a 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 in 15 ways as a sum of consecutive naturals, for example, 1130 + ... + 56943.

It is an arithmetic number, because the mean of its divisors is an integer number (114986520).

Almost surely, 2^1620643211 is an apocalyptic number.

1620643211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1620643211 is a deficient number, since it is larger than the sum of its proper divisors (219141109).

1620643211 is a wasteful number, since it uses less digits than its factorization.

1620643211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58186.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1620643211 is about 40257.2131549118. The cubic root of 1620643211 is about 1174.6157091865.

The spelling of 1620643211 in words is "one billion, six hundred twenty million, six hundred forty-three thousand, two hundred eleven".