81313105 has 16 divisors (see below), whose sum is σ = 99874944. Its totient is φ = 63535360.

The previous prime is 81313081. The next prime is 81313109. The reversal of 81313105 is 50131318.

It is not a de Polignac number, because 81313105 - 2²³ = 72924497 is a prime.

It is a super-2 number, since 2×81313105² = 13223642089482050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81313109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39102 + ... + 41128.

It is an arithmetic number, because the mean of its divisors is an integer number (6242184).

Almost surely, 2^81313105 is an apocalyptic number.

It is an amenable number.

81313105 is a deficient number, since it is larger than the sum of its proper divisors (18561839).

81313105 is a wasteful number, since it uses less digits than its factorization.

81313105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2216.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 81313105 is about 9017.3779448352. The cubic root of 81313105 is about 433.2316549735.

It can be divided in two parts, 81313 and 105, that added together give a palindrome (81418).

The spelling of 81313105 in words is "eighty-one million, three hundred thirteen thousand, one hundred five".