84245521 has 4 divisors (see below), whose sum is σ = 85312000. Its totient is φ = 83179044.

The previous prime is 84245509. The next prime is 84245543. The reversal of 84245521 is 12554248.

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 84245521 - 2⁷ = 84245393 is a prime.

It is a super-2 number, since 2×84245521² = 14194615617122882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84245501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533121 + ... + 533278.

It is an arithmetic number, because the mean of its divisors is an integer number (21328000).

Almost surely, 2^84245521 is an apocalyptic number.

It is an amenable number.

84245521 is a deficient number, since it is larger than the sum of its proper divisors (1066479).

84245521 is a wasteful number, since it uses less digits than its factorization.

84245521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066478.

The product of its digits is 12800, while the sum is 31.

The square root of 84245521 is about 9178.5358854231. The cubic root of 84245521 is about 438.3781909721.

Adding to 84245521 its reverse (12554248), we get a palindrome (96799769).

The spelling of 84245521 in words is "eighty-four million, two hundred forty-five thousand, five hundred twenty-one".