9961144839 has 54 divisors (see below), whose sum is σ = 15456133680. Its totient is φ = 6180082272.

The previous prime is 9961144811. The next prime is 9961144841. The reversal of 9961144839 is 9384411699.

It is a happy number.

9961144839 is a `hidden beast` number, since 99 + 61 + 14 + 483 + 9 = 666.

It is not a de Polignac number, because 9961144839 - 2¹² = 9961140743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9961144859) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 50564089 + ... + 50564285.

Almost surely, 2^9961144839 is an apocalyptic number.

9961144839 is a deficient number, since it is larger than the sum of its proper divisors (5494988841).

9961144839 is a wasteful number, since it uses less digits than its factorization.

9961144839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517 (or 298 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 9961144839 is about 99805.5351120367. The cubic root of 9961144839 is about 2151.6407046513.

The spelling of 9961144839 in words is "nine billion, nine hundred sixty-one million, one hundred forty-four thousand, eight hundred thirty-nine".