81541031 has 8 divisors (see below), whose sum is σ = 95796624. Its totient is φ = 68425920.

The previous prime is 81541001. The next prime is 81541111. The reversal of 81541031 is 13014518.

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 81541031 - 2¹⁴ = 81524647 is a prime.

It is a super-2 number, since 2×81541031² = 13297879473085922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81540988 and 81541006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81541001) 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, 284966 + ... + 285251.

It is an arithmetic number, because the mean of its divisors is an integer number (11974578).

Almost surely, 2^81541031 is an apocalyptic number.

81541031 is a deficient number, since it is larger than the sum of its proper divisors (14255593).

81541031 is a wasteful number, since it uses less digits than its factorization.

81541031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570241.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 81541031 is about 9030.0072535962. The cubic root of 81541031 is about 433.6360696490.

Adding to 81541031 its reverse (13014518), we get a palindrome (94555549).

The spelling of 81541031 in words is "eighty-one million, five hundred forty-one thousand, thirty-one".