1955445589 has 2 divisors, whose sum is σ = 1955445590. Its totient is φ = 1955445588.

The previous prime is 1955445581. The next prime is 1955445593. The reversal of 1955445589 is 9855445591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1955143089 + 302500 = 44217^2 + 550^2 .

It is a cyclic number.

It is not a de Polignac number, because 1955445589 - 2³ = 1955445581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1955445581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977722794 + 977722795.

It is an arithmetic number, because the mean of its divisors is an integer number (977722795).

Almost surely, 2^1955445589 is an apocalyptic number.

It is an amenable number.

1955445589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955445589 is an equidigital number, since it uses as much as digits as its factorization.

1955445589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480000, while the sum is 55.

The square root of 1955445589 is about 44220.4204977746. The cubic root of 1955445589 is about 1250.4948630493.

The spelling of 1955445589 in words is "one billion, nine hundred fifty-five million, four hundred forty-five thousand, five hundred eighty-nine".