84006551 has 4 divisors (see below), whose sum is σ = 84492312. Its totient is φ = 83520792.

The previous prime is 84006547. The next prime is 84006583. The reversal of 84006551 is 15560048.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 84006551 - 2² = 84006547 is a prime.

It is a super-2 number, since 2×84006551² = 14114201221831202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84006751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242621 + ... + 242966.

It is an arithmetic number, because the mean of its divisors is an integer number (21123078).

Almost surely, 2^84006551 is an apocalyptic number.

84006551 is a deficient number, since it is larger than the sum of its proper divisors (485761).

84006551 is a wasteful number, since it uses less digits than its factorization.

84006551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485760.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 84006551 is about 9165.5087692937. The cubic root of 84006551 is about 437.9632987047.

Adding to 84006551 its reverse (15560048), we get a palindrome (99566599).

The spelling of 84006551 in words is "eighty-four million, six thousand, five hundred fifty-one".