9961831 has 4 divisors (see below), whose sum is σ = 10867464. Its totient is φ = 9056200.

The previous prime is 9961817. The next prime is 9961841. The reversal of 9961831 is 1381699.

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 9961831 - 2¹⁷ = 9830759 is a prime.

It is a super-2 number, since 2×9961831² = 198476153745122, which 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 (9961841) 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, 452800 + ... + 452821.

It is an arithmetic number, because the mean of its divisors is an integer number (2716866).

Almost surely, 2^9961831 is an apocalyptic number.

9961831 is a deficient number, since it is larger than the sum of its proper divisors (905633).

9961831 is a wasteful number, since it uses less digits than its factorization.

9961831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905632.

The product of its digits is 11664, while the sum is 37.

The square root of 9961831 is about 3156.2368415567. The cubic root of 9961831 is about 215.1690107876.

The spelling of 9961831 in words is "nine million, nine hundred sixty-one thousand, eight hundred thirty-one".