81541351 has 8 divisors (see below), whose sum is σ = 82955520. Its totient is φ = 80136888.

The previous prime is 81541337. The next prime is 81541357. The reversal of 81541351 is 15314518.

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

It is a cyclic number.

It is not a de Polignac number, because 81541351 - 2⁵ = 81541319 is a prime.

It is a super-3 number, since 3×81541351³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81541357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15660 + ... + 20206.

It is an arithmetic number, because the mean of its divisors is an integer number (10369440).

Almost surely, 2^81541351 is an apocalyptic number.

81541351 is a deficient number, since it is larger than the sum of its proper divisors (1414169).

81541351 is a wasteful number, since it uses less digits than its factorization.

81541351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4853.

The product of its digits is 2400, while the sum is 28.

The square root of 81541351 is about 9030.0249722800. The cubic root of 81541351 is about 433.6366369027.

Adding to 81541351 its reverse (15314518), we get a palindrome (96855869).

The spelling of 81541351 in words is "eighty-one million, five hundred forty-one thousand, three hundred fifty-one".