81361210 has 16 divisors (see below), whose sum is σ = 167371776. Its totient is φ = 27895248.

The previous prime is 81361193. The next prime is 81361213. The reversal of 81361210 is 1216318.

It is not an unprimeable number, because it can be changed into a prime (81361213) 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, 581082 + ... + 581221.

It is an arithmetic number, because the mean of its divisors is an integer number (10460736).

Almost surely, 2^81361210 is an apocalyptic number.

81361210 is an abundant number, since it is smaller than the sum of its proper divisors (86010566).

81361210 is a wasteful number, since it uses less digits than its factorization.

81361210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162317.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 81361210 is about 9020.0449001100. The cubic root of 81361210 is about 433.3170717106.

Adding to 81361210 its reverse (1216318), we get a palindrome (82577528).

The spelling of 81361210 in words is "eighty-one million, three hundred sixty-one thousand, two hundred ten".