1621622104189 has 2 divisors, whose sum is σ = 1621622104190. Its totient is φ = 1621622104188.

The previous prime is 1621622104177. The next prime is 1621622104247. The reversal of 1621622104189 is 9814012261261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1347554148964 + 274067955225 = 1160842^2 + 523515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1621622104189 - 2⁹ = 1621622103677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621622104159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810811052094 + 810811052095.

It is an arithmetic number, because the mean of its divisors is an integer number (810811052095).

Almost surely, 2^{1621622104189} is an apocalyptic number.

It is an amenable number.

1621622104189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621622104189 is an equidigital number, since it uses as much as digits as its factorization.

1621622104189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 43.

The spelling of 1621622104189 in words is "one trillion, six hundred twenty-one billion, six hundred twenty-two million, one hundred four thousand, one hundred eighty-nine".