1620622243 has 2 divisors, whose sum is σ = 1620622244. Its totient is φ = 1620622242.

The previous prime is 1620622231. The next prime is 1620622249. The reversal of 1620622243 is 3422260261.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1620622243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1620622249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810311121 + 810311122.

It is an arithmetic number, because the mean of its divisors is an integer number (810311122).

Almost surely, 2^1620622243 is an apocalyptic number.

1620622243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620622243 is an equidigital number, since it uses as much as digits as its factorization.

1620622243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 1620622243 is about 40256.9527286902. The cubic root of 1620622243 is about 1174.6106434101.

The spelling of 1620622243 in words is "one billion, six hundred twenty million, six hundred twenty-two thousand, two hundred forty-three".