84071974309 has 4 divisors (see below), whose sum is σ = 84297368716. Its totient is φ = 83846579904.

The previous prime is 84071974243. The next prime is 84071974333. The reversal of 84071974309 is 90347917048.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42178890625 + 41893083684 = 205375^2 + 204678^2 .

It is a cyclic number.

It is not a de Polignac number, because 84071974309 - 2²⁹ = 83535103397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84071974339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112696644 + ... + 112697389.

It is an arithmetic number, because the mean of its divisors is an integer number (21074342179).

Almost surely, 2^84071974309 is an apocalyptic number.

It is an amenable number.

84071974309 is a deficient number, since it is larger than the sum of its proper divisors (225394407).

84071974309 is a wasteful number, since it uses less digits than its factorization.

84071974309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225394406.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The spelling of 84071974309 in words is "eighty-four billion, seventy-one million, nine hundred seventy-four thousand, three hundred nine".