81301031 has 8 divisors (see below), whose sum is σ = 93081120. Its totient is φ = 69562368.

The previous prime is 81301013. The next prime is 81301039. The reversal of 81301031 is 13010318.

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 81301031 - 2¹⁸ = 81038887 is a prime.

It is a super-2 number, since 2×81301031² = 13219715283325922, which contains 22 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 (81301039) 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, 6026 + ... + 14103.

It is an arithmetic number, because the mean of its divisors is an integer number (11635140).

Almost surely, 2^81301031 is an apocalyptic number.

81301031 is a deficient number, since it is larger than the sum of its proper divisors (11780089).

81301031 is a wasteful number, since it uses less digits than its factorization.

81301031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20713.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 81301031 is about 9016.7084349002. The cubic root of 81301031 is about 433.2102107142.

Adding to 81301031 its reverse (13010318), we get a palindrome (94311349).

The spelling of 81301031 in words is "eighty-one million, three hundred one thousand, thirty-one".