1955289643 has 2 divisors, whose sum is σ = 1955289644. Its totient is φ = 1955289642.

The previous prime is 1955289617. The next prime is 1955289647. The reversal of 1955289643 is 3469825591.

It is a strong prime.

It is an emirp because it is prime and its reverse (3469825591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1955289643 - 2⁹ = 1955289131 is a prime.

It is not a weakly prime, because it can be changed into another prime (1955289647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977644821 + 977644822.

It is an arithmetic number, because the mean of its divisors is an integer number (977644822).

Almost surely, 2^1955289643 is an apocalyptic number.

1955289643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955289643 is an equidigital number, since it uses as much as digits as its factorization.

1955289643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 52.

The square root of 1955289643 is about 44218.6571822347. The cubic root of 1955289643 is about 1250.4616200113.

The spelling of 1955289643 in words is "one billion, nine hundred fifty-five million, two hundred eighty-nine thousand, six hundred forty-three".