81541240957 has 8 divisors (see below), whose sum is σ = 89026475040. Its totient is φ = 74068072560.

The previous prime is 81541240939. The next prime is 81541241009. The reversal of 81541240957 is 75904214518.

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 81541240957 - 2⁷ = 81541240829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81541240657) 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, 3002283 + ... + 3029320.

It is an arithmetic number, because the mean of its divisors is an integer number (11128309380).

Almost surely, 2^81541240957 is an apocalyptic number.

It is an amenable number.

81541240957 is a deficient number, since it is larger than the sum of its proper divisors (7485234083).

81541240957 is a wasteful number, since it uses less digits than its factorization.

81541240957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6032843.

The product of its (nonzero) digits is 403200, while the sum is 46.

The spelling of 81541240957 in words is "eighty-one billion, five hundred forty-one million, two hundred forty thousand, nine hundred fifty-seven".