84621551 has 4 divisors (see below), whose sum is σ = 96710352. Its totient is φ = 72532752.

The previous prime is 84621521. The next prime is 84621569. The reversal of 84621551 is 15512648.

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 84621551 - 2⁶ = 84621487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84621521) 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, 6044390 + ... + 6044403.

It is an arithmetic number, because the mean of its divisors is an integer number (24177588).

Almost surely, 2^84621551 is an apocalyptic number.

84621551 is a deficient number, since it is larger than the sum of its proper divisors (12088801).

84621551 is a wasteful number, since it uses less digits than its factorization.

84621551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12088800.

The product of its digits is 9600, while the sum is 32.

The square root of 84621551 is about 9198.9972823129. The cubic root of 84621551 is about 439.0294568438.

The spelling of 84621551 in words is "eighty-four million, six hundred twenty-one thousand, five hundred fifty-one".