81541288 has 16 divisors (see below), whose sum is σ = 153578880. Its totient is φ = 40586928.

The previous prime is 81541283. The next prime is 81541297. The reversal of 81541288 is 88214518.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81541283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21070 + ... + 24637.

It is an arithmetic number, because the mean of its divisors is an integer number (9598680).

Almost surely, 2^81541288 is an apocalyptic number.

It is an amenable number.

81541288 is a deficient number, since it is larger than the sum of its proper divisors (72037592).

81541288 is a wasteful number, since it uses less digits than its factorization.

81541288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45936 (or 45932 counting only the distinct ones).

The product of its digits is 20480, while the sum is 37.

The square root of 81541288 is about 9030.0214839169. The cubic root of 81541288 is about 433.6365252248.

The spelling of 81541288 in words is "eighty-one million, five hundred forty-one thousand, two hundred eighty-eight".