84347521 has 4 divisors (see below), whose sum is σ = 85777200. Its totient is φ = 82917844.

The previous prime is 84347507. The next prime is 84347533. The reversal of 84347521 is 12574348.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84347521 - 2¹⁵ = 84314753 is a prime.

It is a super-2 number, since 2×84347521² = 14229008597690882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84347551) 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, 714751 + ... + 714868.

It is an arithmetic number, because the mean of its divisors is an integer number (21444300).

Almost surely, 2^84347521 is an apocalyptic number.

It is an amenable number.

84347521 is a deficient number, since it is larger than the sum of its proper divisors (1429679).

84347521 is a wasteful number, since it uses less digits than its factorization.

84347521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429678.

The product of its digits is 26880, while the sum is 34.

The square root of 84347521 is about 9184.0906463297. The cubic root of 84347521 is about 438.5550412904. Note that the first 3 decimals are identical.

The spelling of 84347521 in words is "eighty-four million, three hundred forty-seven thousand, five hundred twenty-one".