989763561 has 24 divisors (see below), whose sum is σ = 1506747840. Its totient is φ = 624348000.

The previous prime is 989763517. The next prime is 989763563. The reversal of 989763561 is 165367989.

989763561 is a `hidden beast` number, since 9 + 8 + 9 + 76 + 3 + 561 = 666.

It is not a de Polignac number, because 989763561 - 2⁷ = 989763433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 989763498 and 989763507.

It is not an unprimeable number, because it can be changed into a prime (989763563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157836 + ... + 163986.

It is an arithmetic number, because the mean of its divisors is an integer number (62781160).

Almost surely, 2^989763561 is an apocalyptic number.

It is an amenable number.

989763561 is a deficient number, since it is larger than the sum of its proper divisors (516984279).

989763561 is a wasteful number, since it uses less digits than its factorization.

989763561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7117 (or 7114 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 989763561 is about 31460.5079583913. The cubic root of 989763561 is about 996.5761442576.

The spelling of 989763561 in words is "nine hundred eighty-nine million, seven hundred sixty-three thousand, five hundred sixty-one".