1623425989 has 2 divisors, whose sum is σ = 1623425990. Its totient is φ = 1623425988.

The previous prime is 1623425983. The next prime is 1623426031. The reversal of 1623425989 is 9895243261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1341756900 + 281669089 = 36630^2 + 16783^2 .

It is a cyclic number.

It is not a de Polignac number, because 1623425989 - 2³ = 1623425981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1623425981) 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, 811712994 + 811712995.

It is an arithmetic number, because the mean of its divisors is an integer number (811712995).

Almost surely, 2^1623425989 is an apocalyptic number.

It is an amenable number.

1623425989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623425989 is an equidigital number, since it uses as much as digits as its factorization.

1623425989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 49.

The square root of 1623425989 is about 40291.7608078873. The cubic root of 1623425989 is about 1175.2876287555.

The spelling of 1623425989 in words is "one billion, six hundred twenty-three million, four hundred twenty-five thousand, nine hundred eighty-nine".