84557121 has 8 divisors (see below), whose sum is σ = 122992224. Its totient is φ = 51246720.

The previous prime is 84557117. The next prime is 84557153. The reversal of 84557121 is 12175548.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 84557121 - 2² = 84557117 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 2562337 = 84557121 / (8 + 4 + 5 + 5 + 7 + 1 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (84558121) 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 7 ways as a sum of consecutive naturals, for example, 1281136 + ... + 1281201.

It is an arithmetic number, because the mean of its divisors is an integer number (15374028).

Almost surely, 2^84557121 is an apocalyptic number.

It is an amenable number.

84557121 is a deficient number, since it is larger than the sum of its proper divisors (38435103).

84557121 is a wasteful number, since it uses less digits than its factorization.

84557121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562351.

The product of its digits is 11200, while the sum is 33.

The square root of 84557121 is about 9195.4946033370. The cubic root of 84557121 is about 438.9180043448.

It can be divided in two parts, 8455 and 7121, that added together give a triangular number (15576 = T₁₇₆).

The spelling of 84557121 in words is "eighty-four million, five hundred fifty-seven thousand, one hundred twenty-one".