81053541 has 40 divisors (see below), whose sum is σ = 127659840. Its totient is φ = 51150528.

The previous prime is 81053537. The next prime is 81053549. The reversal of 81053541 is 14535018.

It is not a de Polignac number, because 81053541 - 2² = 81053537 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81053549) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 258801 + ... + 259113.

It is an arithmetic number, because the mean of its divisors is an integer number (3191496).

Almost surely, 2^81053541 is an apocalyptic number.

81053541 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

81053541 is a deficient number, since it is larger than the sum of its proper divisors (46606299).

81053541 is a wasteful number, since it uses less digits than its factorization.

81053541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 478 counting only the distinct ones).

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

The square root of 81053541 is about 9002.9740086263. The cubic root of 81053541 is about 432.7701827916.

Adding to 81053541 its reverse (14535018), we get a palindrome (95588559).

The spelling of 81053541 in words is "eighty-one million, fifty-three thousand, five hundred forty-one".