8921287 has 2 divisors, whose sum is σ = 8921288. Its totient is φ = 8921286.

The previous prime is 8921267. The next prime is 8921321. The reversal of 8921287 is 7821298.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8921287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8921207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4460643 + 4460644.

It is an arithmetic number, because the mean of its divisors is an integer number (4460644).

Almost surely, 2^8921287 is an apocalyptic number.

8921287 is a deficient number, since it is larger than the sum of its proper divisors (1).

8921287 is an equidigital number, since it uses as much as digits as its factorization.

8921287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 37.

The square root of 8921287 is about 2986.8523565787. The cubic root of 8921287 is about 207.4001997452.

The spelling of 8921287 in words is "eight million, nine hundred twenty-one thousand, two hundred eighty-seven".