9961631 has 2 divisors, whose sum is σ = 9961632. Its totient is φ = 9961630.

The previous prime is 9961613. The next prime is 9961649. The reversal of 9961631 is 1361699.

Together with previous prime (9961613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (9961613) and next prime (9961649).

It is an emirp because it is prime and its reverse (1361699) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9961631 is a prime.

It is a super-2 number, since 2×9961631² = 198468184360322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9961591 and 9961600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9961531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4980815 + 4980816.

It is an arithmetic number, because the mean of its divisors is an integer number (4980816).

Almost surely, 2^9961631 is an apocalyptic number.

9961631 is a deficient number, since it is larger than the sum of its proper divisors (1).

9961631 is an equidigital number, since it uses as much as digits as its factorization.

9961631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 35.

The square root of 9961631 is about 3156.2051580973. The cubic root of 9961631 is about 215.1675708218.

The spelling of 9961631 in words is "nine million, nine hundred sixty-one thousand, six hundred thirty-one".