81310 has 16 divisors (see below), whose sum is σ = 150336. Its totient is φ = 31648.

The previous prime is 81307. The next prime is 81331. The reversal of 81310 is 1318.

81310 = 54² + 55² + ... + 73².

It is a super-2 number, since 2×81310² = 13222632200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 384 + ... + 556.

It is an arithmetic number, because the mean of its divisors is an integer number (9396).

2⁸¹³¹⁰ is an apocalyptic number.

81310 is a deficient number, since it is larger than the sum of its proper divisors (69026).

81310 is a wasteful number, since it uses less digits than its factorization.

81310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 81310 is about 285.1490838141. The cubic root of 81310 is about 43.3226140481.

Adding to 81310 its reverse (1318), we get a palindrome (82628).

The spelling of 81310 in words is "eighty-one thousand, three hundred ten".