9231661 has 2 divisors, whose sum is σ = 9231662. Its totient is φ = 9231660.

The previous prime is 9231659. The next prime is 9231689. The reversal of 9231661 is 1661329.

It is an a-pointer prime, because the next prime (9231689) can be obtained adding 9231661 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7257636 + 1974025 = 2694^2 + 1405^2 .

It is a cyclic number.

It is not a de Polignac number, because 9231661 - 2¹ = 9231659 is a prime.

Together with 9231659, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9231631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4615830 + 4615831.

It is an arithmetic number, because the mean of its divisors is an integer number (4615831).

Almost surely, 2^9231661 is an apocalyptic number.

It is an amenable number.

9231661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9231661 is an equidigital number, since it uses as much as digits as its factorization.

9231661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 28.

The square root of 9231661 is about 3038.3648563002. The cubic root of 9231661 is about 209.7780042571.

The spelling of 9231661 in words is "nine million, two hundred thirty-one thousand, six hundred sixty-one".