84521669 has 4 divisors (see below), whose sum is σ = 84615360. Its totient is φ = 84427980.

The previous prime is 84521659. The next prime is 84521677. The reversal of 84521669 is 96612548.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-84521669 is a prime.

It is a super-2 number, since 2×84521669² = 14287825061091122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84521659) 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, 45479 + ... + 47300.

It is an arithmetic number, because the mean of its divisors is an integer number (21153840).

Almost surely, 2^84521669 is an apocalyptic number.

It is an amenable number.

84521669 is a deficient number, since it is larger than the sum of its proper divisors (93691).

84521669 is an equidigital number, since it uses as much as digits as its factorization.

84521669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93690.

The product of its digits is 103680, while the sum is 41.

The square root of 84521669 is about 9193.5667180915. The cubic root of 84521669 is about 438.8566545098.

The spelling of 84521669 in words is "eighty-four million, five hundred twenty-one thousand, six hundred sixty-nine".