81313092 has 96 divisors (see below), whose sum is σ = 245145600. Its totient is φ = 22826016.

The previous prime is 81313081. The next prime is 81313109. The reversal of 81313092 is 29031318.

It is a super-2 number, since 2×81313092² = 13223637861200928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 43693 + ... + 45515.

It is an arithmetic number, because the mean of its divisors is an integer number (2553600).

Almost surely, 2^81313092 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81313092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122572800).

81313092 is an abundant number, since it is smaller than the sum of its proper divisors (163832508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81313092 is a wasteful number, since it uses less digits than its factorization.

81313092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1902 (or 1894 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 81313092 is about 9017.3772240048. The cubic root of 81313092 is about 433.2316318858.

The spelling of 81313092 in words is "eighty-one million, three hundred thirteen thousand, ninety-two".