1620138043 has 2 divisors, whose sum is σ = 1620138044. Its totient is φ = 1620138042.

The previous prime is 1620138007. The next prime is 1620138049. The reversal of 1620138043 is 3408310261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1620138043 - 2²¹ = 1618040891 is a prime.

It is not a weakly prime, because it can be changed into another prime (1620138049) 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, 810069021 + 810069022.

It is an arithmetic number, because the mean of its divisors is an integer number (810069022).

Almost surely, 2^1620138043 is an apocalyptic number.

1620138043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620138043 is an equidigital number, since it uses as much as digits as its factorization.

1620138043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1620138043 is about 40250.9384114209. The cubic root of 1620138043 is about 1174.4936506670.

The spelling of 1620138043 in words is "one billion, six hundred twenty million, one hundred thirty-eight thousand, forty-three".