1662534989 has 2 divisors, whose sum is σ = 1662534990. Its totient is φ = 1662534988.

The previous prime is 1662534983. The next prime is 1662535019. The reversal of 1662534989 is 9894352661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1307400964 + 355134025 = 36158^2 + 18845^2 .

It is an emirp because it is prime and its reverse (9894352661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1662534989 - 2¹⁶ = 1662469453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1662534989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1662534983) 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, 831267494 + 831267495.

It is an arithmetic number, because the mean of its divisors is an integer number (831267495).

Almost surely, 2^1662534989 is an apocalyptic number.

It is an amenable number.

1662534989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662534989 is an equidigital number, since it uses as much as digits as its factorization.

1662534989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799360, while the sum is 53.

The square root of 1662534989 is about 40774.1951361397. The cubic root of 1662534989 is about 1184.6505616863.

The spelling of 1662534989 in words is "one billion, six hundred sixty-two million, five hundred thirty-four thousand, nine hundred eighty-nine".