81941310 has 96 divisors (see below), whose sum is σ = 238803552. Its totient is φ = 19319040.

The previous prime is 81941303. The next prime is 81941369. The reversal of 81941310 is 1314918.

It is a super-2 number, since 2×81941310² = 13428756569032200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35512 + ... + 37748.

It is an arithmetic number, because the mean of its divisors is an integer number (2487537).

Almost surely, 2^81941310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81941310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119401776).

81941310 is an abundant number, since it is smaller than the sum of its proper divisors (156862242).

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

81941310 is a wasteful number, since it uses less digits than its factorization.

81941310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2298 (or 2295 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 81941310 is about 9052.1439449448. The cubic root of 81941310 is about 434.3444744003.

The spelling of 81941310 in words is "eighty-one million, nine hundred forty-one thousand, three hundred ten".