81541350 has 288 divisors, whose sum is σ = 274089600. Its totient is φ = 17625600.

The previous prime is 81541337. The next prime is 81541357. The reversal of 81541350 is 5314518.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81541357) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 4291641 + ... + 4291659.

It is an arithmetic number, because the mean of its divisors is an integer number (951700).

Almost surely, 2^81541350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81541350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137044800).

81541350 is an abundant number, since it is smaller than the sum of its proper divisors (192548250).

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

81541350 is a wasteful number, since it uses less digits than its factorization.

81541350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 81541350 is about 9030.0249169091. The cubic root of 81541350 is about 433.6366351301.

Adding to 81541350 its reverse (5314518), we get a palindrome (86855868).

The spelling of 81541350 in words is "eighty-one million, five hundred forty-one thousand, three hundred fifty".