81241560 has 48 divisors (see below), whose sum is σ = 264036240. Its totient is φ = 21664320.

The previous prime is 81241553. The next prime is 81241571. The reversal of 81241560 is 6514218.

81241560 is a `hidden beast` number, since 81 + 24 + 1 + 560 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112476 + ... + 113195.

It is an arithmetic number, because the mean of its divisors is an integer number (5500755).

Almost surely, 2^81241560 is an apocalyptic number.

It is an amenable number.

81241560 is an abundant number, since it is smaller than the sum of its proper divisors (182794680).

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

81241560 is a wasteful number, since it uses less digits than its factorization.

81241560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225688 (or 225681 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 81241560 is about 9013.4100095358. The cubic root of 81241560 is about 433.1045551090.

Adding to 81241560 its reverse (6514218), we get a palindrome (87755778).

The spelling of 81241560 in words is "eighty-one million, two hundred forty-one thousand, five hundred sixty".