84157709 has 2 divisors, whose sum is σ = 84157710. Its totient is φ = 84157708.

The previous prime is 84157699. The next prime is 84157727. The reversal of 84157709 is 90775148.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80604484 + 3553225 = 8978^2 + 1885^2 .

It is a cyclic number.

It is not a de Polignac number, because 84157709 - 2²⁰ = 83109133 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84151709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42078854 + 42078855.

It is an arithmetic number, because the mean of its divisors is an integer number (42078855).

Almost surely, 2^84157709 is an apocalyptic number.

It is an amenable number.

84157709 is a deficient number, since it is larger than the sum of its proper divisors (1).

84157709 is an equidigital number, since it uses as much as digits as its factorization.

84157709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 84157709 is about 9173.7510866602. The cubic root of 84157709 is about 438.2258258065.

The spelling of 84157709 in words is "eighty-four million, one hundred fifty-seven thousand, seven hundred nine".