81031701 has 8 divisors (see below), whose sum is σ = 108705760. Its totient is φ = 53689392.

The previous prime is 81031697. The next prime is 81031711. The reversal of 81031701 is 10713018.

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

It is not a de Polignac number, because 81031701 - 2² = 81031697 is a prime.

It is a super-2 number, since 2×81031701² = 13132273133906802, 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 (81031711) 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, 82366 + ... + 83343.

It is an arithmetic number, because the mean of its divisors is an integer number (13588220).

Almost surely, 2^81031701 is an apocalyptic number.

It is an amenable number.

81031701 is a deficient number, since it is larger than the sum of its proper divisors (27674059).

81031701 is a wasteful number, since it uses less digits than its factorization.

81031701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165875.

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 81031701 is about 9001.7609943833. The cubic root of 81031701 is about 432.7313091050.

Adding to 81031701 its reverse (10713018), we get a palindrome (91744719).

The spelling of 81031701 in words is "eighty-one million, thirty-one thousand, seven hundred one".