670820539 has 2 divisors, whose sum is σ = 670820540. Its totient is φ = 670820538.

The previous prime is 670820537. The next prime is 670820581. The reversal of 670820539 is 935028076.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 670820539 - 2¹ = 670820537 is a prime.

Together with 670820537, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (670820531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335410269 + 335410270.

It is an arithmetic number, because the mean of its divisors is an integer number (335410270).

Almost surely, 2^670820539 is an apocalyptic number.

670820539 is a deficient number, since it is larger than the sum of its proper divisors (1).

670820539 is an equidigital number, since it uses as much as digits as its factorization.

670820539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 670820539 is about 25900.2034547993. The cubic root of 670820539 is about 875.3910802559.

The spelling of 670820539 in words is "six hundred seventy million, eight hundred twenty thousand, five hundred thirty-nine".