670491089 has 2 divisors, whose sum is σ = 670491090. Its totient is φ = 670491088.

The previous prime is 670491079. The next prime is 670491109. The reversal of 670491089 is 980194076.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 645160000 + 25331089 = 25400^2 + 5033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-670491089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (670491079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335245544 + 335245545.

It is an arithmetic number, because the mean of its divisors is an integer number (335245545).

Almost surely, 2^670491089 is an apocalyptic number.

It is an amenable number.

670491089 is a deficient number, since it is larger than the sum of its proper divisors (1).

670491089 is an equidigital number, since it uses as much as digits as its factorization.

670491089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 670491089 is about 25893.8426850864. The cubic root of 670491089 is about 875.2477509054.

The spelling of 670491089 in words is "six hundred seventy million, four hundred ninety-one thousand, eighty-nine".