8261399 has 2 divisors, whose sum is σ = 8261400. Its totient is φ = 8261398.

The previous prime is 8261381. The next prime is 8261411. The reversal of 8261399 is 9931628.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8261399 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8261339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4130699 + 4130700.

It is an arithmetic number, because the mean of its divisors is an integer number (4130700).

Almost surely, 2^8261399 is an apocalyptic number.

8261399 is a deficient number, since it is larger than the sum of its proper divisors (1).

8261399 is an equidigital number, since it uses as much as digits as its factorization.

8261399 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 8261399 is about 2874.2649495132. The cubic root of 8261399 is about 202.1550210206.

The spelling of 8261399 in words is "eight million, two hundred sixty-one thousand, three hundred ninety-nine".