81313346 has 32 divisors (see below), whose sum is σ = 134077680. Its totient is φ = 36827136.

The previous prime is 81313343. The next prime is 81313367. The reversal of 81313346 is 64331318.

It can be written as a sum of positive squares in 8 ways, for example, as 76300225 + 5013121 = 8735^2 + 2239^2 .

It is a super-2 number, since 2×81313346² = 13223720475431432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81313343) 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 15 ways as a sum of consecutive naturals, for example, 136826 + ... + 137418.

Almost surely, 2^81313346 is an apocalyptic number.

81313346 is a deficient number, since it is larger than the sum of its proper divisors (52764334).

81313346 is a wasteful number, since it uses less digits than its factorization.

81313346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758.

The product of its digits is 5184, while the sum is 29.

The square root of 81313346 is about 9017.3913079116. The cubic root of 81313346 is about 433.2320829846.

The spelling of 81313346 in words is "eighty-one million, three hundred thirteen thousand, three hundred forty-six".