8261993 has 2 divisors, whose sum is σ = 8261994. Its totient is φ = 8261992.

The previous prime is 8261969. The next prime is 8261999. The reversal of 8261993 is 3991628.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6165289 + 2096704 = 2483^2 + 1448^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8261993 is a prime.

It is not a weakly prime, because it can be changed into another prime (8261999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4130996 + 4130997.

It is an arithmetic number, because the mean of its divisors is an integer number (4130997).

Almost surely, 2^8261993 is an apocalyptic number.

It is an amenable number.

8261993 is a deficient number, since it is larger than the sum of its proper divisors (1).

8261993 is an equidigital number, since it uses as much as digits as its factorization.

8261993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 8261993 is about 2874.3682784222. The cubic root of 8261993 is about 202.1598659306.

The spelling of 8261993 in words is "eight million, two hundred sixty-one thousand, nine hundred ninety-three".