84040551 has 32 divisors (see below), whose sum is σ = 148485120. Its totient is φ = 45932832.

The previous prime is 84040549. The next prime is 84040577. The reversal of 84040551 is 15504048.

It is not a de Polignac number, because 84040551 - 2¹ = 84040549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84040951) 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 31 ways as a sum of consecutive naturals, for example, 5320 + ... + 14013.

It is an arithmetic number, because the mean of its divisors is an integer number (4640160).

Almost surely, 2^84040551 is an apocalyptic number.

84040551 is a deficient number, since it is larger than the sum of its proper divisors (64444569).

84040551 is a wasteful number, since it uses less digits than its factorization.

84040551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19372 (or 19366 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 84040551 is about 9167.3633614033. The cubic root of 84040551 is about 438.0223764136.

Adding to 84040551 its reverse (15504048), we get a palindrome (99544599).

It can be divided in two parts, 840405 and 51, that added together give a triangular number (840456 = T₁₂₉₆).

The spelling of 84040551 in words is "eighty-four million, forty thousand, five hundred fifty-one".