84634009 has 2 divisors, whose sum is σ = 84634010. Its totient is φ = 84634008.

The previous prime is 84633979. The next prime is 84634027. The reversal of 84634009 is 90043648.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82083600 + 2550409 = 9060^2 + 1597^2 .

It is a cyclic number.

It is not a de Polignac number, because 84634009 - 2¹³ = 84625817 is a prime.

It is not a weakly prime, because it can be changed into another prime (84634409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42317004 + 42317005.

It is an arithmetic number, because the mean of its divisors is an integer number (42317005).

Almost surely, 2^84634009 is an apocalyptic number.

It is an amenable number.

84634009 is a deficient number, since it is larger than the sum of its proper divisors (1).

84634009 is an equidigital number, since it uses as much as digits as its factorization.

84634009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 84634009 is about 9199.6743964121. The cubic root of 84634009 is about 439.0510004519.

The spelling of 84634009 in words is "eighty-four million, six hundred thirty-four thousand, nine".