9877997489 has 2 divisors, whose sum is σ = 9877997490. Its totient is φ = 9877997488.

The previous prime is 9877997471. The next prime is 9877997513. The reversal of 9877997489 is 9847997789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6298009600 + 3579987889 = 79360^2 + 59833^2 .

It is a cyclic number.

It is not a de Polignac number, because 9877997489 - 2¹⁶ = 9877931953 is a prime.

It is not a weakly prime, because it can be changed into another prime (9877990489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4938998744 + 4938998745.

It is an arithmetic number, because the mean of its divisors is an integer number (4938998745).

Almost surely, 2^9877997489 is an apocalyptic number.

It is an amenable number.

9877997489 is a deficient number, since it is larger than the sum of its proper divisors (1).

9877997489 is an equidigital number, since it uses as much as digits as its factorization.

9877997489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576108288, while the sum is 77.

The square root of 9877997489 is about 99388.1154313734. The cubic root of 9877997489 is about 2145.6372674512.

The spelling of 9877997489 in words is "nine billion, eight hundred seventy-seven million, nine hundred ninety-seven thousand, four hundred eighty-nine".