40081551 has 8 divisors (see below), whose sum is σ = 53472384. Its totient is φ = 26705880.

The previous prime is 40081513. The next prime is 40081607. The reversal of 40081551 is 15518004.

40081551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 40081551 - 2¹⁷ = 39950479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40081651) 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 7 ways as a sum of consecutive naturals, for example, 5980 + ... + 10766.

It is an arithmetic number, because the mean of its divisors is an integer number (6684048).

Almost surely, 2^40081551 is an apocalyptic number.

40081551 is a deficient number, since it is larger than the sum of its proper divisors (13390833).

40081551 is a wasteful number, since it uses less digits than its factorization.

40081551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7581.

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

The square root of 40081551 is about 6330.9992102353. Note that the first 3 decimals coincide. The cubic root of 40081551 is about 342.2274486460.

Adding to 40081551 its reverse (15518004), we get a palindrome (55599555).

The spelling of 40081551 in words is "forty million, eighty-one thousand, five hundred fifty-one".