1989609737 has 2 divisors, whose sum is σ = 1989609738. Its totient is φ = 1989609736.

The previous prime is 1989609703. The next prime is 1989609803. The reversal of 1989609737 is 7379069891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1902355456 + 87254281 = 43616^2 + 9341^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989609737 - 2¹⁶ = 1989544201 is a prime.

It is not a weakly prime, because it can be changed into another prime (1989609137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994804868 + 994804869.

It is an arithmetic number, because the mean of its divisors is an integer number (994804869).

Almost surely, 2^1989609737 is an apocalyptic number.

It is an amenable number.

1989609737 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989609737 is an equidigital number, since it uses as much as digits as its factorization.

1989609737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5143824, while the sum is 59.

The square root of 1989609737 is about 44605.0416096656. The cubic root of 1989609737 is about 1257.7354421629.

The spelling of 1989609737 in words is "one billion, nine hundred eighty-nine million, six hundred nine thousand, seven hundred thirty-seven".