8521739 has 2 divisors, whose sum is σ = 8521740. Its totient is φ = 8521738.

The previous prime is 8521703. The next prime is 8521759. The reversal of 8521739 is 9371258.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8521739 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 8521699 and 8521708.

It is not a weakly prime, because it can be changed into another prime (8521759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4260869 + 4260870.

It is an arithmetic number, because the mean of its divisors is an integer number (4260870).

Almost surely, 2^8521739 is an apocalyptic number.

8521739 is a deficient number, since it is larger than the sum of its proper divisors (1).

8521739 is an equidigital number, since it uses as much as digits as its factorization.

8521739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 8521739 is about 2919.2017744582. The cubic root of 8521739 is about 204.2565895340.

The spelling of 8521739 in words is "eight million, five hundred twenty-one thousand, seven hundred thirty-nine".