84730521 has 4 divisors (see below), whose sum is σ = 112974032. Its totient is φ = 56487012.

The previous prime is 84730507. The next prime is 84730531. The reversal of 84730521 is 12503748.

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 not a de Polignac number, because 84730521 - 2¹⁰ = 84729497 is a prime.

It is a super-2 number, since 2×84730521² = 14358522377862882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (84730531) 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, 14121751 + ... + 14121756.

It is an arithmetic number, because the mean of its divisors is an integer number (28243508).

Almost surely, 2^84730521 is an apocalyptic number.

It is an amenable number.

84730521 is a deficient number, since it is larger than the sum of its proper divisors (28243511).

84730521 is a wasteful number, since it uses less digits than its factorization.

84730521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28243510.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 84730521 is about 9204.9183049064. The cubic root of 84730521 is about 439.2178269794.

The spelling of 84730521 in words is "eighty-four million, seven hundred thirty thousand, five hundred twenty-one".