9961684831 has 4 divisors (see below), whose sum is σ = 11384782672. Its totient is φ = 8538586992.

The previous prime is 9961684807. The next prime is 9961684841. The reversal of 9961684831 is 1384861699.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9961684831 - 2³¹ = 7814201183 is a prime.

It is a super-2 number, since 2×9961684831² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9961684841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 711548910 + ... + 711548923.

It is an arithmetic number, because the mean of its divisors is an integer number (2846195668).

Almost surely, 2^9961684831 is an apocalyptic number.

9961684831 is a deficient number, since it is larger than the sum of its proper divisors (1423097841).

9961684831 is a wasteful number, since it uses less digits than its factorization.

9961684831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423097840.

The product of its digits is 2239488, while the sum is 55.

The square root of 9961684831 is about 99808.2402960798. The cubic root of 9961684831 is about 2151.6795839767.

The spelling of 9961684831 in words is "nine billion, nine hundred sixty-one million, six hundred eighty-four thousand, eight hundred thirty-one".