84001551 has 8 divisors (see below), whose sum is σ = 112492080. Its totient is φ = 55756032.

The previous prime is 84001517. The next prime is 84001553. The reversal of 84001551 is 15510048.

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

It is not a de Polignac number, because 84001551 - 2⁹ = 84001039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84001553) 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, 60450 + ... + 61823.

It is an arithmetic number, because the mean of its divisors is an integer number (14061510).

Almost surely, 2^84001551 is an apocalyptic number.

84001551 is a deficient number, since it is larger than the sum of its proper divisors (28490529).

84001551 is a wasteful number, since it uses less digits than its factorization.

84001551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122505.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 84001551 is about 9165.2360035080. The cubic root of 84001551 is about 437.9546094620.

Adding to 84001551 its reverse (15510048), we get a palindrome (99511599).

The spelling of 84001551 in words is "eighty-four million, one thousand, five hundred fifty-one".