993228661 has 2 divisors, whose sum is σ = 993228662. Its totient is φ = 993228660.

The previous prime is 993228653. The next prime is 993228751. The reversal of 993228661 is 166822399.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 992628036 + 600625 = 31506^2 + 775^2 .

It is a cyclic number.

It is not a de Polignac number, because 993228661 - 2³ = 993228653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (993228611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496614330 + 496614331.

It is an arithmetic number, because the mean of its divisors is an integer number (496614331).

Almost surely, 2^993228661 is an apocalyptic number.

993228661 is the 18196-th hex number.

It is an amenable number.

993228661 is a deficient number, since it is larger than the sum of its proper divisors (1).

993228661 is an equidigital number, since it uses as much as digits as its factorization.

993228661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 46.

The square root of 993228661 is about 31515.5304730858. The cubic root of 993228661 is about 997.7377731890.

The spelling of 993228661 in words is "nine hundred ninety-three million, two hundred twenty-eight thousand, six hundred sixty-one".